5 results about "Deformation strain" patented technology

The invention provides a roadway surrounding rock dynamic deformation prediction method and device, equipment and a storage medium, and the method comprises the steps: carrying out the feature extraction of the dynamic data parameter information of the roadway surrounding rock, so as to determine the propagation speed change information of a stress wave in the surrounding rock and the instantaneous strain change rate of the surrounding rock under dynamic loading; determining a wave velocity change index according to the propagation velocity change information of the stress wave in the surrounding rock; determining an instantaneous deformation strain rate index according to the instantaneous strain change rate of the surrounding rock under dynamic loading; inputting the wave velocity change index and the instantaneous deformation strain rate index into a pre-trained machine learning model to generate a surrounding rock deformation index; and performing surrounding rock change state evaluation based on the surrounding rock deformation index. By implementing the method disclosed by the invention, the influence of instantaneous stress wave propagation caused by dynamic loading on the surrounding rock can be effectively combined in the dynamic deformation prediction process of the roadway surrounding rock, so that the accuracy and practicability of a dynamic deformation prediction result of the surrounding rock are effectively improved.

The present application discloses a method for evaluating the low-temperature toughness of ultra-high-strength steel parts. The method for evaluating the low-temperature toughness of ultra-high-strength steel parts includes: obtaining the maximum deformation strain rate of the ultra-high-strength steel parts to be tested: performing a room temperature dynamic three-point bending test on the ultra-high-strength steel parts to be tested, thereby obtaining room temperature test results: performing a low-temperature dynamic three-point bending test on the ultra-high-strength steel parts to be tested, thereby obtaining low-temperature test results: evaluating the low-temperature toughness of the ultra-high-strength steel parts to be tested based on the room temperature test results and the low-temperature test results. The method for evaluating the low-temperature toughness of ultra-high-strength steel parts of the present application uses a dynamic three-point bending test method, which can simulate the high strain rate deformation conditions of the parts during a collision process, conduct dynamic three-point bending tests under room temperature and low-temperature environments, and evaluate the low-temperature toughness of the parts by comparing the test results.

The embodiment of the present application provides a method for determining the deformation of a roll-shaped orthogonal two-way fabric reinforced polymer matrix composite material and related equipment, and the deformation strain energy W of resin can be obtained R , the tensile deformation energy W of fibers under pressure F , and the correction deformation energy W generated by interaction FR The sum of the deformation strain energy W of the resin R , the tensile deformation energy W of the fibers under pressure F and the correction deformation energy W FR is determined as the deformation of the roll-shaped orthogonal two-way fabric reinforced polymer matrix composite material. It can be seen that the present application can determine the deformation of the roll-shaped orthogonal two-way fabric reinforced polymer matrix composite material, which is helpful for the optimization of multiple links such as production, transportation and the like.

The embodiment of the utility model provides an electronic pen. The electronic pen includes a housing; the erasing assembly is located at one end of the shell and connected with the shell, and the erasing assembly can deform in the radial direction of the shell relative to the shell; the strain detection assembly comprises a strain detection element, a deformation part and a fixing support, the fixing support is connected with the erasing assembly, the fixing support is used for installing the deformation part, and at least part of the strain detection element is attached to the deformation part; when the erasing assembly deforms relative to the shell in the radial direction of the shell, the strain detection element is used for detecting deformation of the deformation part. According to the electronic pen, the deformation stroke of the electronic pen is increased through deformation of the erasing assembly in the radial direction of the shell, when the erasing assembly deforms relative to the shell in the radial direction of the shell, deformation of the deformation part can be detected through the strain detection element, and then the use experience feeling of the electronic pen is improved.

This invention discloses a method for testing the dynamic mechanical properties of brittle materials using high-speed variable-depth cutting, relating to the field of dynamic mechanical property testing. It employs a diamond ball-end cutter to perform variable-depth cutting on the surface of the test material, obtaining deformation behavior under different loading conditions. Cutting stress and strain rate are calculated for the plastic region of the cutting area. The stress in the cutting area is dimensionlessly processed under different strain rates, and the relationship curve between dimensionless stress and dimensionless strain rate is fitted to obtain a strain rate-dependent material constitutive model. The cutting area is irradiated using a laser-assisted heating device, with the heating temperature as the cutting variable, to establish a material constitutive model that comprehensively considers the effects of temperature and strain rate. This invention transforms the processing method into a material property testing method, achieving a higher dynamic deformation strain rate than methods such as split Hopkinson bars or tension bars, providing a new solution for dynamic material property testing.