Test data processing method of integral type static progressive damage destruction model
A technology of progressive damage and test data, applied in the direction of electrical digital data processing, CAD numerical modeling, instruments, etc., can solve problems such as strong nonlinearity, engineering application of damage models, and many technical parameters, so as to ensure strength safety and improve precision degree of effect
Active Publication Date: 2020-01-21
NORTHWESTERN POLYTECHNICAL UNIV +1
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Problems solved by technology
This type of model has many technical parameters, strong nonlinearity, and involves the application in the integration process. How to solve the test plan of the model parameters and the processing and analysis of the test data has become the key problem in solving the engineering application of this advanced static damage progressive failure model. one
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[0118] By applying the test design and data processing method proposed by the invention, the parameters of an integral static progressive damage model can be obtained completely. The features and effects of the present invention will be further described in conjunction with the following examples.
[0119] In this example, the domestic 2024-T3 aluminum alloy is used to complete the test data processing of its integral static progressive damage model, that is, the inversion process of the seven model parameters in the ductile fracture envelope of the metal material under the multiaxial stress state. The specific process includes the following steps:
[0120] Step I: Design three types of seven kinds of test pieces according to step 1 of the present invention, in order to reduce the dispersion of test making and data measurement, it is advisable to manufacture 3 to 4 pieces of each kind of test pieces.
[0121] Step II: according to step 4 of the present invention, complete the...
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The invention discloses a test data processing method of an integral type static progressive damage destruction model. A simple mode is adopted to measure far-end test data in the stress damage process of a test piece. The far end is far away from the local change position of the configuration of the test piece and is matched with a fine nonlinear numerical finite element model in the effective section of the test piece, and the optimal model parameters of the integral type static progressive damage destruction model are obtained by adopting a numerical inversion method. According to the method, the fine degree of the static progressive damage destruction model can be improved, high-precision prediction of damage accumulation damage of structural detail dangerous points of the metal material in a multi-axis stress state is facilitated, and the strength safety of the structure is further ensured.
Description
technical field [0001] The invention relates to the technical field of strength failure models of metal structures, in particular to a method for processing test data of integral static progressive damage and failure models. Background technique [0002] Engineering equipment structures in aerospace and other fields usually adopt the concept of light weight design. One of the basic principles in design is to make the dangerous details in the structure just reach the ultimate strength under the action of static ultimate load. The dangerous details of the structure usually refer to the parts of the structure with sudden geometric changes or fastener connections. These parts are in a state of multiaxial stress under the action of external loads. For metal structures, these dangerous details are often in a severely nonlinear state under the action of ultimate loads. Usually the material enters plastic deformation accompanied by damage to the material. The static progressive dam...
Claims
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Login to View More IPC IPC(8): G06F30/23G16C60/00G06F119/14G06F111/10
CPCG16C60/00
Inventor 孙秦刘彦杰刘成玉
Owner NORTHWESTERN POLYTECHNICAL UNIV