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首页> 外文会议>Fracture and strength of solids VII >CRITICAL STRESS INTENSITY FACTOR DETERMINATION FOR AZ61 MAGNESIUM ALLOY
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CRITICAL STRESS INTENSITY FACTOR DETERMINATION FOR AZ61 MAGNESIUM ALLOY

机译：AZ61镁合金的临界应力强度因子测定

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摘要

A stress intensity factor K was used as a fracture parameter to determine the plane strain fracture toughness K_(IC)of AZ61 magnesium alloy using a single edge notch bend (SENB) specimen in accordance to ASTM E399 testing method. Five different specimen thicknesses of 2 to 10 mm were used in the test. A sharp fatigue pre-crack was initiated and propagated to half of specimen width at a constant crack propagation rate of about 1×10~(-8)m/cycle before the specimen was loaded in tension until the fracture stress is reached and then rapid fracture occurred. The fracture toughness K_c values obtained for different thicknesses showed that K_c value decreased with increasing specimen thickness. The highest K_c value obtained was 16.5 MPa√m for 2 mm thickness specimen. The value of K_c became relatively constant at about 13 MPa√m when the specimen thickness exceeds 8 mm. This value was then considered as the plane strain fracture toughness K_(IC) of AZ61 magnesium alloy. Calculation of the minimum thickness requirement for plane strain condition and the size of the shear lips of the fracture surface validate the obtained K_(IC)value.
机译：使用应力强度因子K作为断裂参数，根据ASTM E399测试方法，使用单边切口弯折（SENB）试样确定AZ61镁合金的平面应变断裂韧性K_（IC）。测试中使用了5种不同的2至10 mm的厚度。开始剧烈的疲劳预裂纹，并以大约1×10〜（-8）m /周期的恒定裂纹扩展速率扩展到样品宽度的一半，然后将样品加载到拉伸状态，直到达到断裂应力然后迅速发生骨折。对于不同厚度获得的断裂韧性K_c值表明，K_c值随试样厚度的增加而降低。对于2 mm厚度的样品，获得的最高K_c值为16.5MPa√m。当样品厚度超过8 mm时，K_c的值相对恒定，约为13MPa√m。然后将该值视为AZ61镁合金的平面应变断裂韧性K_（IC）。计算平面应变条件的最小厚度要求以及断裂表面的剪切唇的尺寸可验证所获得的K_（IC）值。

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  • 来源
    《Fracture and strength of solids VII》|2010年|p.1121-1126|共6页
  • 会议地点 Kuala Lumpur(MY);Kuala Lumpur(MY)
  • 作者

    M. A. M. Daud; Z. Sajuri; M. Z. Omar; J. Syari;

  • 作者单位

    Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600, Bangi, Selangor, Malaysia;

    Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600, Bangi, Selangor, Malaysia;

    Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600, Bangi, Selangor, Malaysia;

    Department of Mechanical and Materials Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia 43600, Bangi, Selangor, Malaysia;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料一般性问题;
  • 关键词

    Stress intensity factor; Fracture toughness; Thickness; Shear lips; Magnesium alloy;

    机译：应力强度因子；断裂韧性；厚度;剪唇；镁合金;

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