Method for measuring actual fracture energy of drop hammer tearing test material

A drop weight tear test and fracture energy technology, applied in the field of measurement, can solve problems such as safety hazards

Active Publication Date: 2018-11-30
无锡洲翔成套焊接设备有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the existing methods and devices can measure the crack growth rate, crack opening angle, and overall energy dissipation of the specimen when dynamic fracture occurs in the material, in fact, the measurement of the effective energy for driving the crack growth in the material (i.e. The real fracture energy of the material during dynamic fracture) cannot be measured, because the measured overall energy dissipation of the specimen inevitably includes the energy absorbed by the plastic deformation of various materials that do not directly contribute to the crack propagation, so that the measured results Significantly higher than the real dynamic fracture energy of the material, bringing great safety hazards

Method used

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  • Method for measuring actual fracture energy of drop hammer tearing test material
  • Method for measuring actual fracture energy of drop hammer tearing test material
  • Method for measuring actual fracture energy of drop hammer tearing test material

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing, take the falling weight tearing test of X80 high-strength steel as an example to further illustrate the present invention;

[0026] Step S1, the formula of the traction force-separation law in the cohesion model is expressed as follows:

[0027]

[0028] where T is the traction force, D is the damage scalar, K is the elastic stiffness, δ is the separation displacement, δ 0 is the critical separation displacement at the beginning of damage, δ max Fracture separation displacement, α is a parameter related to material toughness, G adhesion / A is the cohesive energy per unit area, α1 for ductile materials;

[0029] The traction-separation law described by formula (1) is as follows figure 2 As shown; for the drop weight tear test of X80 high-strength steel under a certain impact load, K, δ given by experience can be realized 0 ,δ max and the initial value of α, and then establish the relevant finite element model, such...

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Abstract

The invention provides a method for measuring the actual fracture energy of a drop hammer tearing test material. An impact force-displacement curve, a crack tip opening angle-crack growth length curveand a crack growth length-time curve measured in a drop hammer tearing test are used for calibrating K, alpha, sigma<0> and delta<max> in a tractive force-separation criterion needed for the method for measuring the real fracture energy of the drop hammer tearing test material, then based on the calibrated K, alpha, sigma<0> and delta<max>, the drop hammer tearing test under impact load is simulated by using a finite element method, based on the simulated results, the total energy dissipation in the drop hammer tearing test is analyzed, the proportion of fracture energy of the steady-state crack growth stage in the total energy dissipation is calculated, the ratio of the fracture energy to the total energy dissipation is obtained, and the ratio is multiplied by the integral results of theobtained impact force-displacement curve by simulation to obtain the actual fracture energy of the material. The method for measuring the actual fracture energy of the drop hammer tearing test material has the advantages of low cost and simple and convenient process.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to the application of the measurement technology in a material fracture test, in particular to a method for measuring the real fracture energy of a drop weight tear test material. Background technique [0002] Many scientists and engineers at home and abroad have studied the dynamic fracture toughness of materials, and developed drop weight tearing test methods and test devices. Although the existing methods and devices can measure the crack growth rate, crack opening angle, and overall energy dissipation of the specimen when dynamic fracture occurs in the material, in fact, the measurement of the effective energy for driving the crack growth in the material (i.e. The real fracture energy of the material during dynamic fracture) cannot be measured, because the measured overall energy dissipation of the specimen inevitably includes the energy absorbed by the plastic deformation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/303
CPCG01N3/02G01N3/303
Inventor 于培师徐旦
Owner 无锡洲翔成套焊接设备有限公司
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