仪器化冲击在评测断口剪切面积比例中的应用

根据示波曲线定量给出的特征载荷点分布关系，结合ESIS给出的评测夏比V型冲击断口剪切面积比例(PSF)经验公式，介绍了仪器化冲击试验在估算PSF数值中的具体应用。估算值与实际测量值所进行的误差离散性与置信区间的分析结果表明，选用合适的经验算法可以在试验过程中实时获得高度可靠的PSF结果。与常规光学手工评测技术相比，该方法不依赖于试验者的主观评测经验、不受特定客观试验条件的限制，具有广阔的应用前景，同时也为材料PSF评测以及动态断裂机理的研究提供了一套方便而有效的试验手段。

APPLICATION OF INSTRUMENTED IMPACT TESTING IN EVALUATING THE PERCENTAGE OF SHEAR FRACTURE FOR FRACTURE SURFACE

Based on the determination of characteristic loading points from the instrumented impact testing curve, and with the empirical equations given by European Structural Integrity Society (ESIS) for estimation of percentage of shear fracture (PSF) for CVN specimens, an analytical and in real-time evaluation method for determination of PSF value was introduced in this paper by using instrumented impact testing. In terms of error analysis (by error scatter band method and confidence limit Intervals method respectively) for the correlation between estimated PSF and measured PSF values, it was obviously founded that PSF value could be evaluated highly accurately by instrumentation method, according to the suitable empirical equation. Compared with the common manually optical evaluation method, instrumentation method is of independence on the subjective experience of tester and specific poor experiment conditions objectively, which is expected to be a convenient and effective tool, facilitating the evaluation of PSF index and the study on the mechanism of material dynamics fracture with extensive perspective.