1615results about "Strength properties" patented technology

The invention discloses a hydraulic pressure test tube machine and a tube body clamping centering device, in the tube body clamping centering device, two guide rods and a telescopic oil cylinder are arranged on a base side by side; corresponding ends of the two guide rods are respectively provided with a first sliding block, corresponding other ends of the two guide rods are respectively provided with a second sliding block; a fixed end of the telescopic oil cylinder is fixed on one end of the base, the fixed end of the telescopic oil cylinder is arranged corresponding to the second sliding blocks; a telescopic end of the telescopic oil cylinder is connected with the first sliding blocks, and is used for driving the first sliding blocks to slide along the guide rods, one of two clamping blocks is fixed on the two first sliding block, and the other one of the two clamping blocks is fixed on the two second sliding blocks; the first sliding block on one of the two guide rods is provided with a first rack, the second sliding block on the other one of the two guide rods is provided with a second rack, both sides of a linkage gear are respectively meshed with the two racks, the first sliding blocks and the second sliding blocks are adjusted by the telescopic oil cylinder to move towards each other or depart from each other. The scheme can solve the problems of high control precision and slow regulation efficiency of a plurality of oil cylinders of the tube body clamping centering device.

The invention discloses an on-line monitoring and fault early warning system for the running state of a dynamic compression-shear testing machine, belongs to the technical field of fault diagnosis, and aims to solve the problems of poor adaptability to multiple motion modes, lagging fault early warning and fuzzy fault positioning in the prior art. According to the system, core collaborative link fault sensitive point monitoring parameters are matched according to a current motion mode, a dynamic threshold value is generated to construct a fault judgment threshold value system, real-time data subjected to cyclic division are collected and loaded to generate a time sequence data set, a reference candidate range state is judged based on the threshold value, and a fault judgment reference library is constructed; and executing deviation analysis prediction trend through the reference library, generating a compensation instruction, identifying potential faults in combination with a threshold value, an actual value and a prediction value, calculating a link fault probability, and completing diagnosis. According to the invention, monitoring adaptability and accuracy can be improved, compensation in advance and accurate fault early warning are realized, and stable operation and test accuracy of equipment are guaranteed.

A method for evaluating shale compressibility logging based on game theory, comprising: step 1 of preparing rock core data, conducting experiments, and obtaining rock mechanical parameters and experimental rock physical parameters; step 2 of establishing a relationship between the rock mechanical parameters and the experimental rock physical parameters; step 3 of establishing a relationship between the rock mechanical parameters and the experimental rock physical parameters to predict the formation pore pressure based on the well logging rock physical parameters; step 4 of establishing a relationship between the laboratory and field logging rock physical parameters; step 5 of constructing a geostress calculation model for the research block formation and further obtaining related parameters; step 6 of obtaining the main controlling factors of shale compressibility geomechanics by normalizing the oil recovery intensity; step 7 of obtaining the main expression parameters and ranking of the relatively independent shale compressibility; and step 8 of determining the shale compressibility index. [Effects] A method for evaluating shale compressibility has been established with high accuracy.

The invention relates to the technical field of geotechnical engineering and geological disaster monitoring, in particular to a rockburst tendency dynamic discrimination method, and aims to solve the limitation caused by the fact that a dynamic evolution process is simplified into a quasi-static attribute in traditional rockburst tendency evaluation. According to the method, rockburst tendency is defined as a hidden state variable evolved along with time, a physical constraint state space model containing a hidden state kinetic equation and a multi-modal observation equation is constructed, continuous stress-strain and discrete acoustic emission data are fused, hidden state probability distribution is estimated in real time through online Bayesian inference, and the probability distribution of the hidden state is estimated in real time. And in combination with adaptive information weight updating and physical consistency constraint, predicting a future state trajectory, calculating a risk probability exceeding a critical threshold, and outputting a dynamic rockburst tendency level. According to the scheme, continuous, dynamic and prospective judgment of the rockburst tendency is realized, and the accuracy and reliability of early warning are improved.

The invention discloses a white and black pavement structure exterior and interior disease one-key plotting method oriented to pavement health management, and relates to the technical field of road engineering detection and maintenance. Reflection crack tracing is realized based on an interlayer disease conduction rule by establishing a cement board joint coordinate system; the method comprises the following steps: determining the types of broken slabs and slab corner fractures by utilizing the spatial geometrical relationship between cracks and joints, calculating indexes such as a load transfer coefficient, a reflection crack rate, a slab breakage rate and a pavement condition index, and generating a visual result containing disease distribution and performance parameters in a linkage manner. According to the method, the traditional single structure layer analysis limitation is broken through, the reflection crack recognition accuracy rate exceeds 92%, the broken plate judgment accuracy rate reaches 94% or above, the batch data processing time complexity is optimized to O (n + m), the single road section analysis time is shortened to be within 5 minutes from 2 hours, the problems of low manual detection efficiency, large errors and the like are effectively solved, and quantitative support is provided for precise maintenance of white and black pavements.

The invention provides a dynamic strength test system and method for a soft rock biaxial Hopins compression bar, and the system comprises an axial impact loading unit which is used for generating an axial impact load; the confining pressure loading unit is used for applying radial confining pressure to the sample; the high-pressure fluid injection unit is used for injecting high-pressure fluid into the sample and simulating different internal water pressure and water saturation conditions; the data acquisition unit is used for recording impact load, confining pressure, internal water pressure and sample dynamic response data in real time; the control system is used for coordinately controlling the axial impact speed, the confining pressure and the internal water pressure value; by integrating the axial impact loading unit, the hydraulic servo confining pressure loading unit and the high-pressure fluid injection unit, a test platform capable of truly simulating a complex stress-seepage coupling environment where the deep soft rock is located is formed; therefore, the synchronous, independent and accurate control of axial dynamic load, constant or dynamic confining pressure and internal pore water pressure is realized.

The invention discloses an ultrasonic welding quality online detection system and method, and belongs to the technical field of laser non-contact measurement. According to the invention, the laser vibration measurement probe is rigidly coupled to the welding head to construct a follow-up-common-optical-path measurement unit, so that synchronous acquisition of vibration signals with zero mass loading is realized; further extracting an attenuation section after welding is finished from the signal, and inverting an equivalent modal damping ratio representing an interface energy dissipation state based on an exponential attenuation model; meanwhile, multi-dimensional physical indexes such as an energy transfer efficiency index Itrans and an input stability index Iin are calculated, and in combination with an energy absorption state index, collaborative fusion is carried out through a weighted fusion formula to obtain a comprehensive quality score; and finally, realizing quality attenuation early warning based on time sequence trend analysis of a scoring sequence. On-line sensing of the deep dynamic state in the welding process is achieved, the early defect recognition sensitivity and the system anti-interference capacity are remarkably improved, and the predictive maintenance capacity of quality degradation is achieved.

The invention discloses a handrail comprehensive detection system, which comprises a support frame, a first execution mechanism, a second execution mechanism and a control and data acquisition unit, and is characterized in that the first execution mechanism and the second execution mechanism are arranged on the support frame in a switchable manner; the first executing mechanism is used for applying a static load to a handrail mounted on the supporting frame; the second executing mechanism is used for releasing an impactor on the handrail mounted on the supporting frame; and the control and data acquisition unit is electrically connected with the first execution mechanism and the second execution mechanism and is used for controlling the test process and acquiring test data. According to the invention, various detection functions can be integrated, the operation is automatic and controllable, the applicability to various handrails is high, and the detection efficiency and accuracy are effectively improved.

The invention provides a fractured rock damage prediction method and system, and belongs to the field of rock mechanics and engineering monitoring. The problem that a prediction result obtained by an existing fractured rock damage prediction method is not accurate is solved. According to the technical scheme, the method comprises the following steps: synchronously obtaining a DIC image sequence and an acoustic emission signal in a loading process of a to-be-measured fractured rock, carrying out data processing to generate a gray variance evolution curve and an acoustic emission b value evolution curve, and extracting a gray variance surge point on the gray variance evolution curve and a b value surge point on the acoustic emission b value evolution curve; performing time sequence comparison on the gray variance sharp increase point and the b value sudden drop point on a time axis, and when the gray variance sharp increase point and the b value sudden drop point meet a preset consistency condition on the time axis, judging the corresponding gray variance sharp increase point or b value sudden drop point as a damage critical point of the fractured rock; the method is applied to rock failure prediction.

The invention discloses a storage battery electrode plate strength test system, and relates to the field of electrode plate strength test.The storage battery electrode plate strength test system comprises a multi-angle tool device and an array type impact test device.The multi-angle tool device comprises a base, a first tool platform, a second tool platform and a tool side plate, the first tool platform is rotationally installed on the base, and the second tool platform is rotationally installed on the tool side plate; the second tool platform is rotationally installed on the first tool platform, the rotation axis of the first tool platform is perpendicular to the rotation axis of the second tool platform on the horizontal plane, the array type impact testing device comprises an impact bottom plate, a lifting driving plate and impact rods, the impact rods are arranged on the impact bottom plate in a sliding and penetrating mode, and the impact rods are arranged in a rectangular array mode. The lifting driving plate is arranged above the impact bottom plate, a plurality of driving columns are arranged on the lifting driving plate in a rectangular array mode, each driving column is provided with an impact rod, the driving columns are detachably connected with the impact rods, simulation is conducted by accurately adjusting the tool angle, and it is ensured that a test scene is highly matched with the actual working condition.

The invention discloses a building material mechanical testing system based on multi-algorithm fusion, and belongs to the technical field of building material testing, and the system comprises an initial damage quantification module which is used for obtaining detection information of a tested material test piece before mechanical loading and generating a quantitative evaluation result; the loading and information acquisition module is used for applying a mechanical load to the tested material test piece with the generated quantitative evaluation result and acquiring a mechanical response signal and a microscopic state signal of the tested material test piece; the damage analysis module is used for calling a preset second data processing algorithm and analyzing and generating a dominant damage path; and the diagnosis and prediction module is used for integrating the associated data atlas and the dominant damage path information, generating a material performance diagnosis report and constructing a prediction model through a preset third data processing algorithm. According to the method, the initial damage of the tested material test piece is quantified, so that systematic deviation of a test result caused by neglecting the initial damage is corrected.

The invention belongs to the technical field of centrifugal pump production, and particularly relates to a multi-stage centrifugal pump impeller strength automatic detection system and method.The multi-stage centrifugal pump impeller strength automatic detection system comprises a lifting turnover assembly, a horizontal plate base, a clamping assembly, a cover plate strength detection assembly and a blade strength detection assembly, and the clamping assembly used for clamping and locking a combined closed impeller is arranged below the horizontal plate base; a lifting and overturning assembly used for driving the clamping assembly to conduct lifting and horizontal overturning actions is installed on the upper side of the horizontal plate base. A cover plate strength detection assembly used for detecting the strength of the front cover plate, the rear cover plate or the annular rotating plate is installed on the horizontal plate base, and a blade strength detection assembly used for detecting the strength of blades rotating downwards in different directions is installed on the horizontal plate base. The device is reasonable in design, and meets the requirement for automatic detection of the strength of the cover plate and the blades in the combined closed impeller in different rotation directions.

Globally our environment comprises structures built to perform a meet different requirements including residential, commercial, retail, recreational and service infrastructure. Whilst millions of tons of construction materials are deployed annually the quality control procedures in many instances have not changed to reflect today's demands. Accordingly, it would be beneficial to provide construction companies, engineering companies, infrastructure owners, regulators, etc. with means to automated testing / characterization of construction materials during at least one of its manufacture, deployment in construction and subsequent infrastructure life. It would be further beneficial for such automated methods to exploit self-contained data acquisition / logging modules allowing them to be employed with ease at the different points in the life cycle of a construction material and / or construction project.

The invention provides a high-temperature and high-pressure rock mass in-situ drilling sealing and hydraulic fracturing experiment method which comprises the following steps: S1, placing a drill bit device at a rock mass sample drilling position, and coaxially placing a drill bit sleeve at the tail part of the drill bit device; s2, a drill bit device is started for drilling; when the drill bit device drills, the drill bit sleeve synchronously extends into a drill hole; s3, when the drill bit device drills to a designated position, a drill bit sleeve extends into the bottom of the hole; s4, assembling a hollow water injection fracturing steel pipe; s5, the drill bit device is pulled out, and the drill bit sleeve is reserved; s6, the fracturing steel pipe sleeve is coaxially arranged in the drill bit sleeve; the fracturing steel pipe sleeve is pushed to the bottom of the hole; s7, the drill bit sleeve is taken out; and S8, a nut is used for sealing, and a high-pressure pump is connected for hydraulic fracturing operation. The method is simple and convenient to operate, and rapid and mechanical sealing between the hydraulic fracturing pipe and the hole wall can be achieved after in-situ drilling of the high-temperature and high-pressure large-size rock mass is completed.

The utility model discloses an experimental device for anti-explosion protection of an arch dam, and belongs to the field of simulation explosion tests. The experimental device comprises a fixing mechanism, an explosive module, a displacement sensor module and an acceleration sensor module, wherein the fixing mechanism is used for supporting a high polymer plate; the explosive module is arranged above the high polymer plate and is used for carrying out an anti-explosion test on the high polymer plate; the displacement sensor module and the acceleration sensor module are fixedly mounted on the high polymer plate; the shock wave sensor modules are symmetrically arranged on the two sides of the high polymer plate. According to the experimental device, shock wave sensor modules are installed on the upper side and the lower side of a high polymer plate, an explosive module is installed above the high polymer plate, the explosive module is detonated through an exploder, shock waves on the explosion facing face and the explosion backing face of the high polymer plate are detected through the shock wave sensor modules on the two sides, and displacement data are tested through a displacement sensor module. Acceleration data are tested through the acceleration sensor module, so that comprehensive anti-explosion analysis is carried out on the high polymer plate, and the method is more comprehensive and fine.

The application provides a kind of ice constant temperature dynamic mechanical property testing device, belongs to ice detection technical field, including launch subassembly, impact lever, incident support, incident lever, sample support, transmission support, transmission lever, data acquisition module and data processing module, the end face of impact lever towards incident lever is equipped with several spaced convex structures, the end face of incident lever towards impact lever is equipped with shaping piece, shaping piece is used to extend the rising time of incident stress wave that incident lever transmits to ice sample, the end face of incident lever towards ice sample is equipped with wave modulation module, wave modulation module is used to realize the wave impedance continuous gradient matching of incident stress wave from incident lever to ice sample, data processing module corrects the data collected by data acquisition module to obtain final incident wave strain and final transmission wave strain, and calculates the strain rate, stress and strain of ice sample.The application scheme improves the accuracy of ice constant temperature dynamic mechanical property test results.

The utility model provides a pendulum bob impact device, and belongs to the technical field of pendulum bob impact tests. A pendulum bob impact device comprises a pendulum bob, bases and an abutting piece, a rotating shaft is connected to the pendulum bob, and the bases are arranged on the two sides of the pendulum bob and symmetrically arranged. A containing space capable of containing a tool is formed in the middle of the pendulum bob, and an impact cutting edge is connected into the containing space. The base is connected with an abutting piece, the abutting piece is in an L shape, a first through hole is formed in one side of the abutting piece, and the abutting piece is connected to the base through threads. A protrusion is connected to the side, close to the pendulum bob, of each abutting piece, and a tool can be placed between the two abutting pieces. The utility model has the advantage of high precision.

The invention relates to the technical field of temperature control valve testing, and discloses a temperature control valve cold and hot alternating testing device which comprises a cold and hot testing machine, a separation cover is fixed in the cold and hot testing machine, a net rack is fixed on the top surface of the separation cover, an air port is formed in the top surface of the separation cover, a fixing plate is fixed in the air port, and a temperature control valve is arranged in the fixing plate. A plurality of first air channels are formed in the fixed plate, two guide plates are fixed to the inner top face of the separation cover, each guide plate is obliquely arranged, a driving assembly is arranged in the separation cover, a flow guide assembly is arranged in the separation cover and used for guiding airflow, and a rotating assembly is arranged in the separation cover. According to the invention, recovery and secondary utilization of hot gas are realized, energy is saved, and the test cost is reduced.

The utility model belongs to the technical field of absorption rods, and particularly relates to a Hopkinson pressure bar absorption rod which comprises a first rod used for being connected with a main rod of a Hopkinson pressure bar. The first bulge is fixed with the edge of the first rod; the second rod is used for being connected with the first rod, a circular groove is formed in the second rod, and a part of the first rod and the first protrusion are arranged in the circular groove. The spring in the pre-compression state is arranged in the circular groove of the second rod, so that the rigidity of the spring is increased, the energy absorption range is widened, meanwhile, certain thrust is applied to the first rod, and the energy absorption effect is improved. When the impact force is smaller than the thrust, the first rods are kept relatively static, when the impact force is larger than the thrust, the first rods extrude the elastic pieces, the elastic pieces reduce reflected waves by absorbing part of impact energy, and therefore the energy absorption efficiency is improved, and the shock wave absorption capacity of the absorption rods is improved.

The invention belongs to the technical field of detection devices, and particularly relates to an elevator landing door strength detection device, which comprises a support mechanism, an impact mechanism, a fixing mechanism and a test mechanism, and is characterized in that the impact mechanism performs self-adaptive strength impact on the surface of a door plate body according to test requirements during working; when the impact mechanism works, the fixing mechanism is automatically driven to work, the two sides of the door plate body are clamped and fixed, and meanwhile the clamping strength of the door plate body is adjusted in a self-adaptive mode according to the impact strength of the impact mechanism. When the fixing mechanism starts to work, the testing mechanism is automatically driven to work, the door plate body to be impacted is preprocessed, data of the maximum deformation quantity generated after the door plate body is impacted is marked in real time, the elevator landing door strength detection device replaces a traditional elevator landing door strength testing mode, and the detection efficiency is improved. The problem that the test accuracy is affected due to the fact that the deformation quantity in the impact test process is not accurate enough is solved.

The application provides a kind of aviation tire dynamic simulation test machine dynamic load calibration device and method, it is related to aviation tire test equipment field, including: fixed frame, it is arranged between the flywheel and loading frame of test machine, and is fixed on the base of test machine;Mobile frame, it is arranged on fixed frame, and can be moved and locked along the loading direction of test machine;Loading plate, it is installed on mobile frame, for the load of aviation tire;Calibration load sensor, for measuring real-time load value in calibration process;Arc tooling, it is installed on fixed frame, and arc tooling is adapted and installed on the arc contact surface of flywheel, arc tooling is connected with one end of calibration load sensor;The other end of calibration load sensor is connected with loading plate.The application realizes load calibration on test machine, and the device can be used for calibrating the dynamic load of tire in particular, so that it can simulate the real working condition of tire, and improve the measurement accuracy of load of aviation tire dynamic simulation test machine.

The application belongs to the technical field of battery accessory testing, and particularly relates to a power impact testing system for new energy vehicles, which comprises a bottom plate, a fixing mechanism for fixing the position of a power supply is arranged on the upper surface of the bottom plate, two supporting plates are fixedly connected to the bottom plate, a guide groove is arranged in the supporting plate, a top plate is fixedly connected to the two supporting plates, a hydraulic cylinder is fixedly installed on the top plate, a driving pressing plate is fixedly connected to the output end of the hydraulic cylinder, and a sliding block is slidably connected to the guide groove. The impact force of an impact head on the power supply can be changed by adjusting the hydraulic pressure of the hydraulic cylinder, the value of the impact force can be accurately measured and read by a pressure measuring plate, the power supply is limited and fixed by the fixing mechanism, so that the power supply is prevented from shaking and deviating when being impacted by the impact head, and the power supply surface can be sprayed with fire extinguishing agent by the fire extinguishing mechanism, so that the power supply is prevented from being deformed and damaged due to fire.

The invention relates to the technical field of engines, and discloses a clamping device and a test method for a composite material casing installation edge simulation piece, the clamping device for the composite material casing installation edge simulation piece comprises a supporting piece, the surface of the supporting piece is used for placing a simulation piece; the first limiting piece is located on the simulation piece, the first limiting piece is connected with the supporting piece through a first fixing piece, a limiting space is formed between the first limiting piece and the supporting piece, and the first side edge of the simulation piece is located in the limiting space; the second limiting piece is located on the supporting piece, one end of the second limiting piece is connected with the supporting piece, the other end of the second limiting piece abuts against the second side edge of the simulation piece, and the length of the second side edge is larger than that of the first side edge. According to the invention, precise fixation of the simulation piece is realized, the operation process is simplified, the simulation piece is protected, the reliability and efficiency of the test are improved, and the problems of poor clamping precision and complex operation of a clamping device in the prior art are solved.

The invention discloses a vertical tunnel loading resistance performance test device and method, and relates to the technical field of test of resistance performance of protective equipment such as doors under specific loading. The device comprises a retaining wall arranged in an underground tunnel, a plurality of door front pressure boxes are arranged on the retaining wall, protective equipment is arranged on the front side of the retaining wall, a fixing rod is arranged on the rear side of the protective equipment, a plurality of door rear pressure boxes are arranged on the fixing rod in the height direction, and a sensor connecting rod is vertically connected to the fixing rod. A displacement sensor is arranged at one end of the sensor connecting rod close to the protective equipment. The method comprises the following steps of test protection equipment installation, test point arrangement, cable arrangement, connection test, loading device arrangement, tunnel sealing, detonation and post-detonation inspection. According to the invention, safe, controllable, repeatable and comparable resistance performance evaluation can be carried out on the whole door or door frame-wall body composite structure under the real boundary constraint and vertical installation state.

The application relates to the technical field of data error correction, in particular to a calibration error correction method and system of a drop hammer type deflectometer, which comprises the following steps: obtaining deflection values of a displacement sensor of the drop hammer type deflectometer to form a deflection time sequence, calculating deflection abnormal values of each deflection value, obtaining each deflection right sequence of each deflection value, further obtaining deflection continuation characteristic values of each deflection value, obtaining load transfer weights of each deflection value through the correlation degree between local deflection sequences of the same bit sequence deflection value in adjacent deflection time sequences, obtaining road loose influence degrees of each deflection value in combination with the deflection continuation characteristic values of the corresponding deflection values, further obtaining deflection vibration characteristic values of each deflection value and smoothing window scales of each deflection value, and performing smoothing treatment on each deflection time sequence to correct deflection data errors of the drop hammer type deflectometer. The application can improve the calibration error correction precision of the drop hammer type deflectometer.

The utility model relates to an in-situ torsion experiment device for X-ray CT (Computed Tomography), and belongs to the technical field of scientific instruments for in-situ torsion experiments for X-ray CT. Comprising a driving assembly, a torque sensor and a clamp assembly. Two ends of a shaft of the torque sensor are respectively connected with the driving assembly and a clamp. The driving assembly comprises a motor, an outer shell, a worm gear and a worm, the worm gear and the worm are rotationally arranged in the outer shell and meshed, the upper end of the worm gear is in key connection with the lower end of the torque sensor, and one end of the worm is connected with the output end of the motor. The driving assembly is stable in transmission during an experiment, has a self-locking function, prevents reverse rotation, improves the detection accuracy, is compact in structure, has a large transmission ratio, is suitable for speed reduction, is low in noise and small in vibration, and effectively prevents the influence on other works in a laboratory.

The invention relates to a friction measurement system and a friction measurement method for measuring the friction of a fibrous web in connection with a unwinder of a slitter winder, the unwinder being configured to unwind a fibrous web (W), the fibrous web being configured to travel forward on at least one roll (12), the roll being configured to support the travel of the fibrous web. The friction measurement system (10) comprises a friction measurement device (20), the friction measurement device comprising a sample holding part (27) for holding a sample (15) cut from the fibrous web. The friction measurement system further comprises a movable support element (30-33) to support and transfer the friction measurement device, the friction measurement device being configured to press the sample (15) against a surface of the fibrous web to measure the friction between the surface of the sample and the surface of the fibrous web, and to provide a measuring movement between the surface of the sample and the surface of the fibrous web by moving the sample by the friction measurement device and / or by moving the fibrous web.

The invention relates to the technical field of concrete impact resistance tests, and discloses a concrete impact resistance test device and method, which solves the problem of low test precision, and comprises a support frame, a support plate is arranged at the top of the support frame, a test box is arranged at the top of the support plate, and an adjusting frame is arranged at the top of the support plate. An adjusting fluted disc is slidably connected into the adjusting frame, a guide rail is arranged on the inner side of an adjusting gear, an auxiliary barrel is arranged at the bottom of the guide rail, a main barrel is slidably connected to the outer portion of the auxiliary barrel, two locking heads are arranged in the auxiliary barrel, a supporting disc is tightly attached to the tops of the two locking heads, and an electromagnet is arranged at the bottom of the supporting disc. A plurality of balancing weights are arranged at the bottom of the electromagnet, and a test head is arranged at the bottom of the balancing weight at the lowermost end; according to the device, the clamping screw can be driven to rotate through the clamping motor, so that the clamping sliding block can be driven to rotate, the clamping plate is driven to move along the clamping groove, a test block is clamped, and the device is adaptive to test blocks with different sizes.

A fibre-reinforced polymer composite component 2 formed from a polymer matrix material containing fibre reinforcement. The component 2 comprises a main portion 4 and at least one raised feature 6 extending from a surface plane s of said main portion 4. The at least one raised feature 6 is arranged to incur visually perceptible damage when the component 2 is subject to an impact with an energy above a predetermined impact energy threshold and to resist an impact with an energy below the predetermined impact energy threshold.