Determination of Ductile Tearing Resistance parameter of Interstitial-Free Steel Sheet

Procedia Structural Integrity Pub Date : 2024-01-01 DOI:10.1016/j.prostr.2024.05.042

S.K. Chandra , P.S. De , P.C. Chakraborti

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Abstract

The present work deals with the characterization of ductile tearing resistance of 1 mm thick interstitial free steel sheet using crack tip opening angle (φ), and δ₅ concepts with some experimental modification. CTOA (φ) measurements on the specimen surface at the growing crack tip have been performed using light microscope on both pre-cracked DENT and SENT specimens at three ramp rates following the essence of ASTM E 2472. In order to determine the effect of pre-cracking, CTOA of the notched (ρ:0.1 mm) SENT specimen has also been measured at 10^-4 s^-1. The transferability of φ−Δα and δ₅−Δα between two geometries has been verified. It is concluded that for a specified thickness both φ−Δα and δ₅−Δα plots can be used for crack growth characterisation of sheet metals even without using pre-cracked specimens. However, the angle φ(δ₅) determined from δ₅−Δα curve is not the true measure of optical CTOA,φ as the δ₅ gauge position does not follow the tip position of the growing crack.

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无间隙钢板韧性抗撕裂参数的测定

本研究采用裂纹尖端张开角 (φ)、δ5 和一些实验修正概念，对厚度为 1 毫米的无间隙钢板的韧性抗撕裂性能进行了表征。按照 ASTM E 2472 的精髓，在三种斜率下，使用光学显微镜对预开裂的 DENT 和 SENT 试样生长裂纹尖端的试样表面进行了 CTOA（φ）测量。为了确定预开裂的影响，还以 10-4 s-1 的速率测量了缺口（ρ:0.1 mm）SENT 试样的 CTOA。φ-Δα和δ5-Δα在两种几何形状之间的可转移性已得到验证。结论是，对于特定厚度，即使不使用预裂纹试样，φ-Δα 和 δ5-Δα 图也可用于表征金属板的裂纹生长。然而，根据 δ5-Δα 曲线确定的角度 φ(δ5) 并不是光学 CTOA,φ 的真实测量值，因为 δ5 量规的位置并不跟随裂纹生长的尖端位置。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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