4 results about "Test compression" patented technology

The invention discloses a method for testing compression performance through a testing machine, which comprises the following specific steps: placing a sample on the upper end surface of a compression main body, and enabling two end surfaces of the sample to be parallel; after the extensometer is fixed, the testing machine is reset, and the extensometer is reset; starting the testing machine for compression, synchronously acquiring sample load data and average deformation data on two sides by the extensometer, transmitting the data into the testing machine, generating a stress-strain curve by the testing machine, and reading the compression yield strength, the compression elastic modulus and the compression strength from the curve. The extensometers on the two sides are directly hung between the upper cover and the compression main body to form a closed symmetrical measurement chain, so that knife edges on the two sides are located in the same rigid frame, bending deformation is offset, the reading difference is reduced to one tenth of the original value, meanwhile, a load line and a measurement line coincide, a secondary force transmission path is avoided, and the measurement accuracy is improved. And the flexibility of the rack only affects the overall displacement without changing the relative deformation in the gauge length of the extensometer, so that the repeatability of the elastic modulus is remarkably improved.

The invention discloses a method for testing compression creep performance of a metal material under a constant-temperature condition, relates to the technical field of high-temperature performance testing of metal materials, and aims to solve the problem of inaccurate creep measurement at a constant temperature. According to the invention, a full-process compression creep performance test method of constant temperature control, loading compensation and strain correction is constructed, the test accuracy and the result consistency of the metal material in a constant temperature environment are improved, closed-loop control is realized through actual measurement temperature, time delay prediction and retaining ring heating are introduced, the constant temperature stability is ensured, and the test accuracy is improved. A micro-stepping compensation mechanism is adopted to maintain constant pressure stress, a loading state is automatically recovered after interruption, then system deformation is deducted through main and auxiliary link cooperation and a compliance template, strain measurement precision is ensured, distortion caused by boundary friction is overcome in combination with end face stick-slip detection and equivalent strain correction, and the accuracy of strain measurement is improved. Finally, automatic output of performance parameters is achieved through steady-state segment extraction and anomaly recognition, and the effectiveness, reproducibility and engineering applicability of test data are guaranteed.

The application provides a kind of thick section composite compression performance test method and test device, it is related to test or analysis material technical field, including the following steps: design test piece size and determine working section length;Estimate failure load and calculate minimum friction load;Determine the groove parameter of netted groove, calculate the comprehensive friction coefficient of clamping surface and calibration correction, calculate minimum pre-tightening force;According to pre-tightening force, determine bolt diameter and tightening torque, and then determine test piece clamping length and total length;Prepare test piece and process netted groove, apply tightening torque in stages so that end face parallelism meets requirements;Apply axial compression load, collect load-displacement and load-strain data, calculate compression strength and compression modulus and determine failure mode;Real-time monitoring and abnormal early warning are carried out during testing.The problem that thick section composite compression performance test is prone to premature abnormal failure is solved, and its compression strength and compression modulus can be accurately and reliably obtained.

The invention relates to the technical field of spring performance testing, and discloses a compression performance testing tool and method for a compression spring. The device comprises a first connecting piece, a pressing head, a sleeve and a second connecting piece which are sequentially arranged from top to bottom in the vertical direction; the first connecting piece is connected with an upper connecting seat of an electronic testing machine, the second connecting piece is connected with a lower connecting seat of the electronic testing machine, and the test cavity arranged in the sleeve provides a test space for a compression spring to be tested. The sleeve can effectively prevent the compression spring from flying out due to transverse bending and overlarge load, and potential safety hazards are prevented. And the pressing head and the sleeve which are used for extruding the compression spring are detachably connected with the first connecting piece and the second connecting piece correspondingly, the pressing heads and the sleeves of different specifications can be replaced according to the compression springs of different diameters, and the applicability is improved.