一种用于小块超弹性样品材料表征的逆有限元方法

2019/12/27   下载量： 0 次

方案摘要

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应用领域 生物产业
检测样本 其他
检测项目
参考标准 暂无

采用LaVison公司的StrainMaster系统，对小块超弹性样品材料的材料力学特性以及全场应变特性进行了测量研究。

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The aim of this research was to develop and test an experimental method,
which could be scaled to samples of 4 mm x 4 mm x 1-2 mm in size. To
validate the design of the experimental method, it was applied to samples
(10 mm by 10 mm by 2.5 mm in size) of a soft hyperelastic silicone-rubber
using available equipment.
The biggest challenge in this research was the small scale at which testing
was performed. In addition, the size of force measurements was small (under
10 N), which meant that force measurements inherently included noise, which
could not be neglected.
The method was designed such that stress concentrations were avoided and
boundary conditions were simple enough to be easily implemented in a finite
element analysis. A uni-axial compression test was performed where full-field
displacement data was measured using digital image correlation and force data
was measured using a 50 N load cell. Displacement and force results for compressions
of between 20-55 % of the height of the sample were used in an
inverse finite element model updating method to iteratively determine a three
parameter Mooney-Rivlin material model for the hyperelastic silicone-rubber.
There was a large amount of variability in the force results, even though the
displacement inputs for the tests were repeatable. The inverse finite element
model updating method showed repeatability in the value to which it converged,
however the material model obtained from the optimization process
produced accurate displacements neither when plotted against the experimental
displacements nor when implemented in a validation test geometry.

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北京欧兰科技发展有限公司
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