Objective

Validate and assess the limitations of the Shear Compression 0 Specimen (SCS0) as a simple shear specimen for quasi-static and dynamic large strain loading conditions. Propose a simple data reduction procedure, using a simple, back of the envelope method, as a first approximation for the strain, as opposed to cumbersome numerical simulations and avoid the use of ad-hoc data reduction factors.

Methods

Static and dynamic finite elements simulations were performed in which the large deformation options was turned on and off. Assessment of the Lode parameter in each case and evaluation of the accuracy of the specimen’s strains and stresses as determined through simple data reduction and full numerical simulations.

Results

The SCS0 was shown to undergo simple shear, both statically and dynamically, as evidenced from the very low values of the Lode parameter. The calculated stress is in excellent agreement with the measured one, determined using simple strength of materials definitions. When assuming the corresponding kinematics, it is observed that the calculated and the measured strain diverge to an extent of about 25%. This discrepancy is shown to result from the assumption of large geometrical deformations in the numerical model as opposed to the simple analytical kinematics.

Conclusion

The conclusion is that the SCS0 is now fully validated, and the experimentalist will decide which strain approximation is suitable, between analytical and numerical.

中文翻译：

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使剪切变得简单 - 用于剪切测试的剪切压缩样本 0 (SCS0) 的验证

客观的

验证和评估剪切压缩 0 样本 (SCS0) 作为简单剪切样本在准静态和动态大应变载荷条件下的局限性。提出一个简单的数据缩减程序，使用简单的包络背面方法作为应变的第一近似值，而不是繁琐的数值模拟，并避免使用临时数据缩减因子。

方法

执行静态和动态有限元模拟，其中打开和关闭大变形选项。通过简单的数据简化和完整的数值模拟来评估每种情况下的洛德参数，并评估样本应变和应力的准确性。

结果

SCS0 经受了静态和动态的简单剪切，正如 Lode 参数的极低值所证明的那样。计算出的应力与使用简单的材料强度定义确定的测量应力非常一致。当假设相应的运动学时，可以观察到计算应变和测量应变的偏差约为 25%。这种差异是由于数值模型中假设存在较大几何变形而不是简单的解析运动学造成的。

结论

结论是 SCS0 现已得到充分验证，实验人员将决定分析应变近似法和数值应变近似法哪种更合适。