88 results about "Spallation" patented technology

Apparatus and methods of using lasers are provided for the perforation of oil and gas well casings and rock formations. A rock removal process called laser spallation is provided that utilizes a combination of laser-induced thermal stress and laser induced superheated steam explosions just below the surface of the laser/rock interaction to spall or fracture the rock into small fragments that can then be easily removed from the rock formation. The use of high power laser beams of kilowatt level is provided to rapidly cut the steel casings and perforate into the formation. Techniques of the invention increase permeability and reduce hole tapering while perforating a deep hole in reservoir rock formations.

A method of remotely monitoring the radiant energy (6) emitted from a turbine component such as a turbine blade (1) having a low-reflective surface coating (3) which may be undergoing potential degradation is used to determine whether erosion, spallation, delamination, or the like, of the coating (3) is occurring.

Internal components of power generation machines, such as gas or steam turbines, are inspected with a laser profilometer inspection system that is inserted and positioned within the turbine, for example through an inspection port that is in communication with an open inter-row spacing volume between an opposing turbine vane and turbine blade row. Component surface profile scans are performed to determine relative profile heights along a two-dimensional scan line generated by the profilometer. Three-dimensional profile information is obtained by translating the scan line across the surface. Real time profile information is gathered without physical contact, which is helpful for extracting off-line engineering information about component surface conditions, including surface spallation, perforation, and gaps between components. The system is capable of determining blade tip gap between a turbine blade tip and its opposing abradable surface in the turbine casing.

The invention discloses a quick surrounding rock stress measuring method applicable to buried circular tunnels. The method includes: setting each circle of spallation blastholes, buffering blastholes and smooth blasting blastholes to be detonated in two sections, determining main stress on a tunnel face to determine axial stress of the tunnel according to the maximum main stress on the tunnel face. The quick surrounding rock stress measuring method applicable to the buried circular tunnels has the advantages that conventional blasting operations and vibration monitoring are utilized, no extra equipment is needed, operation is convenient, and real-time and dynamic estimation of the surrounding rock stress close to the tunnel face during blasting construction can be realized. The quick surrounding rock stress measuring method applicable to the buried circular tunnels is mainly applicable to quick measuring of the surrounding rock stress of the deep buried underground constructions in the field of hydropower, communication, mines and the like.

The invention relates to a foam concrete preform release agent and a preparation method thereof. The foam concrete preform release agent comprises the following components by weight percent: 50-60% of waste oil, 1.5-1.8% of stearic acid, 1.0-1.5% of alkylphenol polyoxyethylene ether (OP-10 emulsifier), 0.02-0.05% of flake caustic soda, 12-15% of talc, 0.01-0.03% of phosphoric acid and 40-45% of water (60-80 DEG C). When the release agent prepared by adopting the formula is used for mould release, the foam concrete preform has no oil stain on the surface, no spallation and no edge defect and is good for second construction; and the preform has low dimensional deviation, the film-forming speed is high, the production cycle is short and the work efficiency is increased. In addition, the prepared release agent can be used to prevent the wooden mould from warping and deforming.

The invention relates to a free interface forming device which is used for a windowless spallation target of a subcritical system driven by an accelerator. The free interface forming device comprises an annular inlet flow-equalizing section, a taper-shaped gathering section and a lower pressure-control cavity, wherein the annular inlet flow-equalizing section, the taper-shaped gathering section and the lower pressure-control cavity are formed into a communicated fluid channel; the annular inlet flow-equalizing section is used for supplying a stable inlet flowing condition to the taper-shaped gathering section; the taper-shaped gathering section is arranged between the annular inlet flow-equalizing section and the lower pressure-control cavity and is used for forming a free interface by gathering the fluid entering the annular inlet flow-equalizing section at a preset conical angle; and the fluid is discharged into the lower pressure-control cavity in a free falling form at an outlet of the taper-shaped gathering section. The invention provides the free interface forming device for the windowless spallation target, which can be used for forming more stable and complete free interface; the size of a cycling area on a fluid side of the free interface is reasonably and effectively reduced by a flowing field of the free interface formed by the device; and the heat removing capacity of the flowing field is increased.

The invention discloses a method for determining the safe drilling fluid density of a coal bed based on a structural element analysis model. The method has the advantages of coal bed cleat and fracture development, big rock brittleness, low strength and obvious anisotropy and discontinuity. The borehole wall instability characteristics of the method are different from those of the common sandstone stratum. The phenomenon that the traditional borehole wall stability model based on the mechanics of continuous media is difficult to be successful for solving coal bed instability problems can be eliminated. In the method, the coal bed is composed of discrete blocks. A coal briquette which has the biggest possibility of generating spallation between surface cleats is analyzed to carry out force analysis. A structural element model of collapse pressure is built by the stressed balance condition among pressure stress, shearing strength and shaft pressure. A coefficient c is introduced to judge the stable relationship of borehole pressure and borehole wall so as to judge the range of the safe drilling fluid density.

'pre-control roof open stoping spallation subsequent filling mining method' is characterized in that advantages of backfill mining method and spallation mining method are adopted, respective disadvantages are made up, a bran new mining technology is formed, and the method has the advantages of low ratio of mined tonnage to development, high efficiency, good safety and strong practicability and is especially applicable to the mine industry.

The invention relates to a rescue method after ball spallation in big tree transplanting. The method adopts the treatment steps as follows: (1) pouring gaps of a soil ball by adopting mud mixed with a rooting agent after transplanting so as to form a whole; (2) swathing boughs of a tree trunk and below and trunk parts by adopting a plastic film until the bottom of the trunk; and (3) conducting transfusion treatment to the trunk. Leaves and/or branches with leaves of the tree can be further pruned towards special trees before transplanting, and anti-transpirant spraying and/or overshadowing tothe whole tree can be conducted after being transplanted. With the method, a root system can be better contacted with soil and water, new roots of the root system can be quickened, water and nutrientcan be timely supplemented, cells of the tree and enzyme activity can be stimulated, water transpirating of the tree can be slow down, the absorption strength of the tree body can be reduced, nutrition consumption can be decreased, the up and down balance of the tree can be increasingly achieved again, and the survival rate of the whole canopy transplanted tree can be improved.

Provided is a studding recovery method for reconstructing a covering layer through dead zone wastefill and top surrounding rock spallation collaboratively. The method comprises the specific steps that after waste rock is exploited out from a chamber and a top column through an open-stope method, a goaf is filled with the waste rock to reach a certain height, surrounding rock at the top of a studding is collapsed off once, and the studding covering layer is reconstructed collaboratively; the studding is divided into a plurality of layers, and a drilling drift is tunneled in the center of the bottom of the layers; an end non-through cutting groove is formed in the tail end of the drilling drift through a cutting courtyard slot broaching method; the cutting groove serves as the ore breaking free face, and the studding is subjected to sequential top-to-bottom interlamination advance and in-layers retreating type recovery; and broken ore is shoveled to a winze through a scooptram and is conveyed to the surface of the earth by an ore pocket through an electric locomotive. The invention first provides the method for collaboratively reconstructing the studding covering layer, the safety of studding recovery is improved, and the ore recovery rate is increased effectively.

The invention provides a smooth blasting method based on phi 32 mm cartridges. The method includes the steps that punching, powder charging and the initiation process are conducted on a working face, and a smooth blasting layer is composed of a peripheral smooth blasting hole array located on the outer side and more close to the boundary of the top, and an outer ring spallation hole array located in the peripheral smooth blasting hole array. The density coefficient m of peripheral smooth blasting holes ranges from 1.25 to 1.43. Charged powder in the peripheral smooth blasting holes in the peripheral smooth blasting hole array comprises bottom charged powder located at the bottoms and multiple bags of middle charged powder located at different depths in the holes. The powder charging amount of the middle charged powder is smaller than that of the bottom charged powder. The intervals between the bottom charged powder and the middle charged powder and between the bags of the middle charged powder are the same, and the initiation time of the peripheral smooth blasting hole array is later than that of the outer ring spallation hole array. Smooth blasting powder string processing procedures and processing materials are reduced; smooth blasting powder string processing cost, and cost of materials such as bamboo chips and adhesive tape are saved, and over-excavation is effectively controlled, so that a large amount of concrete backfill caused by over-excavation is reduced, and construction cost is reduced.

The invention discloses a tunnel blasting method. The method comprises the steps of arranging a circle of periphery holes at the positions, close to a tunnel excavation outline, on a tunnel blasting working surface, arranging a circle of secondary-circle holes at the positions, on the inner sides of the periphery holes, on the tunnel blasting working surface, arranging spallation holes at the positions, on the inner sides of the secondary-circle holes, on the tunnel blasting working surface, and arranging breaking-in holes at the positions, on the inner sides of the spallation holes, on the tunnel blasting working surface; filling explosives, wherein the periphery holes, the breaking-in holes, the spallation holes and the secondary-circle holes are filled with explosives; detonation, wherein the secondary-circle holes, the breaking-in holes, the spallation holes and the periphery holes are detonated in sequence, or the secondary-circle holes and the breaking-in holes are detonated firstly at the same time and then the spallation holes and the periphery holes are detonated in sequence. By the adoption of the method, tunnel surrounding rock can be effectively protected, the influence of blasting disturbance on the surrounding rock is reduced, crack formation on the tunnel surrounding rock is reduced, and the completeness of the tunnel surrounding rock can be well maintained.

Methods and apparatus are disclosed for direct measurement of the tensile strength of joints with use of laser spallation. A laser pulse is directed at a surface in communication with a solder joint, generating a stress wave to separate the solder ball from its underlying structure. The solder joint may be measured either prior to joining of a PCB board or CSP package, or after they have been joined. The joints for testing may be prepared by polishing either the PC board or the CSP package to expose the desired solder joint for testing. The tensile strength of the embedded joints may also be measured in-situ.

The invention relates to the technical field of powder metallurgy, and more specifically, discloses a combined strengthening treatment method for metal plasma immersion ion implantation and depositionon the surfaces of spallation target balls. The strengthening treatment method comprises the steps of carrying out pre-treatment of the spallation target balls, carrying out TiSiN, TiAlN, TiAlSiN, TiAlSiN/h-BN ion implantation and deposition, and the like. The method has the advantages that the problems that the wear rate of the spallation target tungsten-iron-nickel target balls in a non-intermetallic compound form prepared through a powder metallurgy technology is high, the residual stress between a thin film and a matrix is large, the film-matrix binding force is poor, and the bearing capacity of a single film layer is poor can be solved, the surface of the thin film is effectively prevented from being peeled off, and a functionally gradient composite material which is high in film-matrix binding force, high in hardness, low in friction coefficient and high in wear resistance can be prepared.

The invention relates to an experimental method for testing fracture mechanical properties in the field of material, and discloses a type I crack specimen dynamic symmetrical tensile device and an experimental method thereof. The specimen dynamic symmetrical tensile device includes a power supply, a capacitor charger, loading guns and a waveguide-rod rod system. The capacitor charger adopts a power supply part of a conventional electromagnetic riveting device; two loading guns with the same parameters are connected in parallel and then access the capacitor charger. The invention also relates to the experimental method based on the specimen dynamic symmetrical tensile device. Because the parameters of the two loading guns are the same and access the capacitor charger in parallel, the discharge current can be synchronously and evenly distributed into the two loading guns, same compression stress waves are produced in the two loading guns, are reflected into tensile waves in two convex platforms respectively and then enter tensile rods, and the specimen is loaded; therefore, the specimen can be symmetrically loaded, and a specimen crack is guaranteed to be extended into a type I spallation crack.

The invention discloses a spallation target visual auxiliary system and a spallation target visual auxiliary method based on GPU hardware acceleration. The spallation target visual auxiliary system is characterized in that: firstly, a geometrical modeling module establishes a module by virtue of a visual method, so that direct conversion of a common CAD module to an MCNP module is completed; secondly, a grain flow simulative transportation module, based on a molecular dynamics algorithm, realizes blending GPU hardware acceleration to visually stimulate movement, in various containers, of grains, and to output associated physical quantity; thirdly, a high-energy Monte Carlo computing module develops a simulation program of intermediate-high-energy atomic nucleus spallation reaction in a GPU edition, so that nuclear reaction processes of particles such as neutrons, protons and the like in an ADS (accelerator driven sub-critical system) spallation target and atoms in a target material can be efficiently stimulated. The modeling module has the advantages of visually generating a three-dimensional model and quickly converting the three-dimensional model into an input file which can be identified by MCNP. The grain flow module and the high-energy Monte Carlo computing module adopt the concurrent thought, so that the computing can be accelerated by GPU. Very critical effect on the design and the stimulation process of the spallation target is achieved.