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Characterizations of Creep-fatigue Crack Initiation and Growth Life for P92 using Circular Notched Round Bar Specimen

机译:用圆缺口圆棒试样表征P92的蠕变疲劳裂纹萌生和生长寿命

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摘要

A testing method under creep-fatigue interaction conditions has been proposed as the ASTM standard E2714-09. In accordance with the ASTM standard, round bar smooth specimens have been recommended as a testing specimen. Additionally, creep-fatigue crack initiation and growth life are usually defined as the attainment of a specific rate of decrease in the maximum tensile stress or the modulus of elasticity ratios. However, these criterions of crack initiation and growth life on ASTM standard are not characterized in terms of physical crack size. In this study, the creep-fatigue crack initiation and growth tests for P92 were conducted using circular notched round bar specimens. An attempt is made to measure the crack length during the tests by the direct current potential drop method, which results in the establishment of a high accuracy crack length measurement. Additionally, the life of creep-fatigue crack growth was characterized by linear cumulative damage law combined with the Qconcept which has been proposed as fracture parameter to describe the life of creep crack growth.
机译:已经提出了在蠕变-疲劳相互作用条件下的测试方法,作为ASTM标准E2714-09。根据ASTM标准,推荐使用圆棒光滑试样作为测试试样。另外,通常将蠕变疲劳裂纹的萌生和生长寿命定义为达到最大拉伸应力或弹性模量比的特定降低率。但是,这些根据ASTM标准制定的裂纹萌生和增长寿命标准并未根据物理裂纹尺寸进行表征。在这项研究中,P92的蠕变疲劳裂纹萌生和扩展测试是使用圆形缺口圆棒试样进行的。尝试通过直流电势下降法在测试期间测量裂纹长度,这导致建立了高精度的裂纹长度测量。另外,蠕变疲劳裂纹扩展的寿命通过线性累积损伤定律结合Qconcept来表征,Qconcept被提出作为描述蠕变裂纹扩展寿命的断裂参数。

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  • 来源
  • 会议地点 San Antonio TX(US)
  • 作者单位

    Graduate School of Engineering, Tohoku Univ., Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-City 980-8579, Japan;

    Graduate School of Engineering, Tohoku Univ., Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-City 980-8579, Japan;

    Graduate School of Engineering, Tohoku Univ., Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-City 980-8579, Japan;

    Faculty of Science and Engineering, Ishinomaki Senshu Univ., Shinmito, Minamisakai, Ishinomaki-City 986-8580, Japan.;

    Graduate School of Engineering, Tohoku Univ., Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-City 980-8579, Japan;

    National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan;

    Steel Research Laboratories, Nippon Steel Corporation, Shintomi 20-1, Futtsu-City 293-8511, Japan;

    Graduate School of Engineering, Tohoku Univ., Aoba 6-6-01, Aramaki, Aoba-ku, Sendai-City 980-8579, Japan;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TB534.3;
  • 关键词

    P92; creep-fatigue; crack initiation life; crack growth life; circular notched round bar specimen; linear cumulative damage law; Q~* concept;

    机译:P92;蠕变疲劳裂纹萌生寿命裂纹增长寿命;圆形缺口圆棒试样;线性累积损伤定律; Q〜*概念;

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