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Estimation of J-resistance Curves for CT Specimen Based on Unloading Compliance Method and CMOD Data

机译:基于卸荷柔度法和CMOD数据的CT试件J电阻曲线估计

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摘要

The unloading compliance method is one of the most widely used methods in laboratory testing for J-resistance estimation. A specimen configuration including compact tension (CT) is recommended by almost all the standard test procedures for evaluating fracture toughness, such as ASTM E1820-11, ISO 12135-2002, and GB/T 21143-2007. In the unloading compliance method, key techniques including instantaneous crack size measurement, correction of specimen rotation, and J-integral computation can be used for a CT specimen when using load line displacement (LLD) but not when using crack mouth opening displacement (CMOD) from those standard test procedures. However, a CT specimen with CMOD measurement is also used for J-resistance estimation under certain severe environments because of the convenience of measuring displacement. This study proposes a simplified linear formula for crack size calculation for a CT specimen with CMOD data, discusses the rotation correction in detail based on the equivalence of work, and develops reasonable incremental expressions for J-integral computation and a CMOD-to-LLD conversion equation. By measuring the LLD and CMOD data of a CT specimen simultaneously, we carried out experiments on J-resistance curve estimation for four different types of materials. According to the developed procedure of the unloading compliance method in this study, J-resistance curves for all materials determined from LLD and CMOD data of the CT specimen are clearly exhibited.
机译:卸载顺应性方法是实验室测试中用于J电阻估计的最广泛使用的方法之一。几乎所有用于评估断裂韧性的标准测试程序都建议采用包括紧密张力(CT)的样品配置,例如ASTM E1820-11,ISO 12135-2002和GB / T 21143-2007。在卸料柔顺法中,当使用载荷线位移(LLD)时,CT试样可以使用包括瞬时裂缝尺寸测量,试样旋转校正和J积分计算在内的关键技术,而在使用裂缝口张开位移(CMOD)时则不能使用从那些标准的测试程序。但是,由于具有测量位移的便利性,在某些恶劣环境下,带有CMOD测量的CT样品也可用于J电阻估算。这项研究提出了一个简化的线性公式,用于计算具有CMOD数据的CT试样的裂纹尺寸,并基于功的等效性详细讨论了旋转校正,并为J积分计算和CMOD到LLD的转换开发了合理的增量表达式。方程。通过同时测量CT样品的LLD和CMOD数据,我们对四种不同类型的材料进行了J电阻曲线估计的实验。根据本研究中开发的卸载顺应性方法的程序,清楚显示了根据CT样品的LLD和CMOD数据确定的所有材料的J阻力曲线。

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