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非晶合金理想裂纹预制方法及其在小试样$K_{\rm Ic}$测试中的应用

谢怡玲 刘泽

谢怡玲, 刘泽. 非晶合金理想裂纹预制方法及其在小试样$K_{\rm Ic}$测试中的应用[J]. 力学学报, 2020, 52(2): 392-399. doi: 10.6052/0459-1879-19-377
引用本文: 谢怡玲, 刘泽. 非晶合金理想裂纹预制方法及其在小试样$K_{\rm Ic}$测试中的应用[J]. 力学学报, 2020, 52(2): 392-399. doi: 10.6052/0459-1879-19-377
Xie Yiling, Liu Ze. A GENERAL METHOD TO INTRODUCE PRE-CRACK IN BULK METALLIC GLASSES FOR PLANE STRAIN FRACTURE TOUGHNESS TEST[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(2): 392-399. doi: 10.6052/0459-1879-19-377
Citation: Xie Yiling, Liu Ze. A GENERAL METHOD TO INTRODUCE PRE-CRACK IN BULK METALLIC GLASSES FOR PLANE STRAIN FRACTURE TOUGHNESS TEST[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(2): 392-399. doi: 10.6052/0459-1879-19-377

非晶合金理想裂纹预制方法及其在小试样$K_{\rm Ic}$测试中的应用

doi: 10.6052/0459-1879-19-377
基金项目: 1)国家自然科学基金项目(11602175);武汉市科技局应用基础前沿项目(2019010701011390)
详细信息
    通讯作者:

    刘泽

  • 中图分类号: O344.3

A GENERAL METHOD TO INTRODUCE PRE-CRACK IN BULK METALLIC GLASSES FOR PLANE STRAIN FRACTURE TOUGHNESS TEST

  • 摘要: 介绍了一种简单、低成本且可靠的方法在非晶合金中预制理想裂纹并应用于小试样平面应变断裂韧性的测试.近年来,非晶合金由于高弹性、高强度、耐磨及软磁性等优异性能 展示了广泛的应用前景.断裂韧性作为材料工程应用的一个重要指标,也引起了非晶合金领域的广泛关注. 然而,由于非晶合金的亚稳态结构以及最大可铸造尺寸的限制,目前关于非晶合金断裂韧性的测试还存在较大的挑战.一方面,铸造工艺造成的非晶合金热历史的差异、内部微孔洞和杂质等缺陷以及裂纹预制方式等都会显著影响其断裂韧性测试的可靠性;另一方面,非晶合金可铸造尺寸的限制使得目前绝大多数报导的断裂韧性值都是非平面应变的断裂韧性,导致即使是对于同种非晶合金,所报导的断裂韧性值也存在较大偏差.本文利用非晶合金在过冷液相温度下具有可热塑性成型的特性,对预制有缺口的非晶合金试样进行局部压缩成型,使得预制的缺口裂纹重新闭合形成类似疲劳裂纹的理想裂纹面.基于该方法对Zr基非晶合金进行断裂韧性测试,实验结果表明,随着试样厚度的增加,测试值迅速降低并趋向于一个定值.需要指出的是,通过设计实验使得试样在理想裂纹面区域形成局部凹陷,使得趋于定值的试样厚度远小于平面应变断裂韧性测试标准中的试样厚度要求.

     

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出版历程
  • 收稿日期:  2019-12-30
  • 刊出日期:  2020-04-10

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