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首页> 外文会议>ASME Pressure Vessels Piping Conference;High-Pressure Technology Student Paper Symposium and Competition;Annual Student Paper Competition Conference;Rudy Scavuzzo Student Paper Symposium;ASME Nondestructive Evaluation, Diagnosis and Prognosis Division >PROPOSAL OF NEW CODE CASE FOR ALTERNATIVE UT FLAW EVALUATION AND ACCEPTANCE CRITERIA OF SUBSURFACE FLAW NEAR COMPONENT SURFACE IN SECTION VIII DIVISION 2 AND DIVISION 3
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PROPOSAL OF NEW CODE CASE FOR ALTERNATIVE UT FLAW EVALUATION AND ACCEPTANCE CRITERIA OF SUBSURFACE FLAW NEAR COMPONENT SURFACE IN SECTION VIII DIVISION 2 AND DIVISION 3

机译：关于第八节第2节和第3节中近表面副翼的UT UT替代评定和合格标准的新代码案例的提案

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摘要

The current proximity rules for subsurface flaws near the surfaces of component in Section VIII Division 2 and Division 3 are different from those of Section XI. The current acceptance criteria of Sec. XI were revised in 2008 in order to eliminate the discontinuity of acceptable and unacceptable flaws based on the research work by Dr. K. Hasegawa and Dr. K. Miyazaki el. The fracture mechanics evaluation for the current and proposed alternative acceptance criteria for subsurface flaws near a component's surfaces based on Section XI have been performed. The stress intensity factors for transformed surface flaws of the current acceptance criteria for subsurface flaws near component's surfaces are much larger and too conservative compared with the overall acceptance criteria. It is confirmed herein that the proposed alternative converting rules have enough fracture margin. Therefore, the safety level of this proposal is almost the same as that of the current code. The proposed alternative acceptance criteria may avoid unnecessary weld repairs, and eliminate the discontinuity of acceptable and unacceptable flaws in the area near the component's surface.
机译：第八节第2分区和第3分区中组件表面附近的次表面缺陷的当前接近规则与第XI部分不同。当前的验收标准在长谷川博士和宫崎骏博士的研究工作的基础上，于2008年对XI进行了修订，以消除可接受和不可接受的缺陷的不连续性。根据第XI节，对构件表面附近的次表面缺陷的当前和提议的替代验收标准进行了断裂力学评估。与整体接受标准相比，当前零件表面附近次表面缺陷的接受标准的变形表面缺陷的应力强度因子要大得多且过于保守。在此证实，提出的替代转换规则具有足够的断裂裕度。因此，该建议的安全等级与当前法规的安全等级几乎相同。拟议的替代验收标准可以避免不必要的焊接维修，并消除零件表面附近区域中可接受和不可接受的缺陷的不连续性。

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