11 results about "Spall" patented technology

The invention relates to the technical field of composite material testing, in particular to a recycling method and device for composite material tensile fragments, and the method comprises the steps that the bottom of a protective cover is adjusted to a preset inclination angle through an angle adjusting mechanism; covering a protective cover outside a clamping block for clamping the composite material in the tensile test device, so as to collect fragments generated in the tensile process of the composite material through the protective cover; the fragments in the protective cover are blown to the bottom of the protective cover through a plurality of air injection assemblies; and the fragments at the bottom of the protective cover are adsorbed through the movable suction cup and transferred to a preset recycling area outside the protective cover. According to the technical scheme, splashing fragments can be blocked through the protective cover, the fragments are guided to fall to the bottom of the protective cover in a concentrated mode, meanwhile, the fragments attached to the side wall of the protective cover and clamped in the grooves of the clamping blocks are blown through the air injection assemblies, and the collection efficiency of the composite material tensile fragments is improved.

The utility model relates to the technical field of material mechanics impact resistance experiments, in particular to a material mechanics impact resistance experiment device which comprises an experiment box, a base is connected to the lower surface of the inner wall of the experiment box in a sliding mode, and a splash-proof box is fixedly connected to the upper surface of the base. Four sliding blocks a and four clamping plates are driven by four air cylinders a to get close to each other to clamp and fix an iron ball, a servo motor a drives a screw a to rotate, the screw a rotates to drive a threaded sleeve a, a movable frame a and a movable frame b to move upwards, the height of the iron ball is adjusted according to experimental design, an electromagnet is powered off, and the iron ball is fixed. The iron ball falls onto the surface of an experimental material under the action of self weight to carry out an impact resistance experiment, and meanwhile, fragments generated by material crushing are blocked by the splash-proof box, so that the problems that when an existing material is smashed, the material is likely to shake and collide with other parts, the test result is inaccurate, and fragments are likely to fly out when the material is damaged to hurt experimenters are solved.

A method for manufacturing an embossed sheet of substrate, the method being configured to produce a controlled thickness of the embossed sheet of substrate embossed in a congruency nip, and to reduce a content of first and second types of clusters initially present in a non-embossed sheet of substrate. The method comprises providing an embossing roller system comprising at least a first and a second embossing roller, comprising first embossing structures protruding from or recessed in a first base surface of the first embossing roller, each of the protruding first embossing structures protruding from the first base surface and comprising rising flanks oriented away from the first base surface towards a summit that tops the protruding first embossing structure, and each of the recessed first embossing structures recessing from the first base surface and comprising recessing flanks oriented from the first base surface inside of the first embossing roller towards a bottom that delimits the recessed first embossing structure, second embossing structures protruding from or recessed in a second base surface of the second embossing roller, congruent according to the congruency nip separating each of the second embossing structures during embossing at least along the rising and recessing flanks from respective corresponding first embossing structures of the first embossing roller, and forming a summit nip between each of the summits of the first embossing structures and a corresponding counter side on the second embossing structures, with a value of the summit nip at least greater than the congruency nip. The method further comprises adjusting the first embossing roller and the second embossing roller for embossing with a base nip between a portion of the first base surface and a corresponding portion of the second base surface, and the congruency nip, whereby the congruency nip has a value smaller than the average starting thickness of the non-embossed substrate; inserting the non-embossed sheet of substrate in a roller nip comprising at least base nip zones of the base nip, congruency nip zones of the congruency nip and summit nip zones of the summit nip; embossing the non-embossed sheet of substrate, thereby producing the controlled thickness value of the embossed sheet of substrate smaller than the average starting thickness for parts of the sheet of substrate embossed in the congruency nip zones; compressing in the congruency nip zones at least one of the first type of clusters inside the embossed sheet of substrate; and processing at least one of the second type of clusters by compressing in the congruency nip zones the at least one second type of cluster inside the embossed sheet of substrate and for each one of the at least one second type of cluster either maintaining the at least one second type of cluster inside the embossed sheet of substrate; or causing the at least one second type of cluster to emerge from the embossed sheet of substrate, by migrating it from the congruency nip zones to one of the summit nip zones, and to remain as debris in proximity of the second roller's counter side of the one of the summit nip zones.

A ballistic sound reducing panel is disclosed comprising a frame with a front porous sheet disposed in the frame for enabling sound to enter into the sound reducing panel. A sound absorbing member dissipates sound entering into the front porous sheet. A ballistic plate is located within the frame for inhibiting penetration of ballistic projectiles and shrapnel. A ricochet plate is framed about the ballistic plate for arresting ricocheting ballistic projectiles and shrapnel. A fragmentation containment layer adjacent to the ballistic plate inhibits high energy fragmentations leaving the surface of the ballistic plate. A spall reducing membrane overlays the fragmentation containment layer for encapsulating ricocheting fragments from the ballistic plate. A rear sheet disposed in the frame.

The application provides a kind of anti-explosion glass compression resistance performance multidimensional analysis method, belongs to the technical field of testing the strength characteristics of solid materials by applying pressure, the method comprises: in the process of applying compression load to anti-explosion glass sample by pressure head, hardware synchronous trigger and parallel acquisition three-dimensional force-displacement time history signal of compression contact surface, high-speed full-field strain image sequence of sample back and piezoelectric sensor array vibration waveform signal;Time-frequency analysis on vibration waveform signal, match strain concentration area to identify micro-crack propagation, interlaminar delamination and other damage events, quantify the distribution ratio and evolution process of work done by external force in structural deformation, material damage dissipation and fragment splashing kinetic energy during compression process;Calculate effective energy dissipation ratio, dominant failure mode evolution sequence and other indicators to generate dynamic evolution spectrum of compression resistance performance.The application realizes the accurate evaluation of the protection efficiency, failure mechanism and critical point of anti-explosion glass under compression load.

The application discloses a kind of plating adhesion detection system and detection method, belong to metal material surface plating detection technical field.Detection system includes deformation mould, flat mould and hydraulic press, deformation mould includes bi-convex upper die and bi-concave lower die, respectively installed on hydraulic press for sample stamping deformation;Flat mould can be detachably installed on hydraulic press, for flattening after sample deformation.Detection method includes: sample is placed on bi-concave lower die, and hydraulic press drives bi-convex upper die to go down and carries out simulation stamping deformation;After sample deformation, it is placed into flat mould and flattened;Paste adhesive tape in flattening area and tear, observe whether to take out plating fragment to judge adhesion.The application truly simulates the composite stress under the condition of stamping R angle or flanging by bi-convex upper die and bi-concave lower die cooperation, combined with flat tape detection, with the advantages of simple structure, low cost, convenient operation, high detection accuracy, suitable for galvanizing, aluminizing steel coil production line on-site rapid off-line detection.

The invention belongs to the technical field of ceramic-based composite materials, and particularly relates to a high-temperature self-healing ceramic-based composite material and a preparation method thereof.The surface of metal powder is coated with a compact coating, so that metal can be prevented from being oxidized and flowing out in the high-temperature sintering process, the metal content in the composite material is kept, interface bonding between the metal and a ceramic matrix is improved, and the service life of the composite material is prolonged. The density of the finally obtained composite material reaches 98.5% or above, and the maximum bending strength can reach 450-550 MPa. In the high-temperature service process, when the tip of a crack makes contact with metal powder particles coated with the coating, the brittle coating on the surface of the metal powder particles is broken due to stress concentration, molten metal flows out and is driven by capillary force to permeate and fill along the crack, crack healing and fragment gathering are promoted, and therefore the self-healing function is achieved. Through detection, the bending strength recovery rate of the composite material after precracking and high-temperature repair for 1 h is up to 85% or above, and the composite material shows good high-temperature self-healing ability.

The invention discloses a trapezoidal blade-roller adaptive plastic film residue crushing device, and belongs to the field of agricultural plastic film residue recovery treatment equipment. The device mainly comprises a rack, a crushing assembly and a blower device, the crushing assembly comprises a crushing blade and a crushing roller, a trapezoidal protruding part is arranged at the cutting edge of the crushing blade, a friction groove matched with the protruding part is formed in the inner side of the crushing roller, and through cooperation of the trapezoidal protruding part and the friction groove, shearing and friction cooperative crushing of the residual film is achieved; discharging holes are distributed in the wall of the crushing roller in an array mode, an auxiliary tearing structure is formed on the edges of the discharging holes, the residual film is torn in the crushing process, meanwhile, residual film fragments meeting the particle size after crushing fall to an inclined discharging plate through the discharging holes and are conveyed out through an air blowing device in an auxiliary mode, and material accumulation is effectively prevented. According to the invention, through the matching of the blade and the roller profile and the tearing function of the edge of the discharge hole, the crushing efficiency and uniformity are obviously improved, and the problem of discharge blockage is solved.

The invention relates to a process in which a material (4) is extruded by means of a multi-stage extruder (1) comprising at least two extruder stages (2, 3), for which the material (4) is plasticized in a first extruder stage (2) of the multi-stage extruder (1) and subsequently transferred to a further, preferably second, extruder stage (3) of the multi-stage extruder (1), brought into a fragmented state via a splitting device (5) of the multi-stage extruder (1) and in this state is exposed to a vacuum, preferably a technical vacuum, in a vacuum chamber (6) of the multi-stage extruder (1), so that volatile components and / or trapped gases are at least partially removed from the material (4).In addition, at least one material flow and / or at least one mass pressure of the material (4) is automatically adjusted through the first extruder stage (2) and / or the further extruder stage (3) in such a way that, at least in normal operation of the multi-stage extruder (1), the vacuum zone (6) is filled with no more than a predetermined maximum volume of the material (4) permissible for the removal of the components and / or gases, and / or the fragmented state of the material (4) is maintained and / or is maintained.

A preformed composite fragmentation warhead includes preformed composite fragments tightly packed around a casing that includes an explosive. The preformed composite fragments include an inner core encapsulated with an outer jacket. The inner core and outer jacket are formed from different metal materials with the density of the material for the outer jacket being lower than the density of the material for the inner core. Upon contact with a “soft” target, the outer jacket deforms and widens to increase the diameter of the preformed composite fragment. Upon contact with a “hard” target, the outer jacket erodes or shatters allowing the inner core to penetrate the hard target. The outer jacket also serves to reduce spalling upon detonation of the warhead explosive. The outer jacket fully encapsulates the inner core to ensure that the outer jacket impacts the target.