CAJ | 학술논문

针对船用气瓶使用过程中出现的疲劳失效问题，开展含裂纹气瓶安全评价及剩余寿命预测研究，通过疲劳裂纹扩展速率试验，得到疲劳裂纹扩展速率公式。对3种典型尺寸表面裂纹进行理论计算，获得船用气瓶安全评定结果和临界裂纹尺寸，并通过3种人工预制裂纹疲劳试验和安全评价验证理论公式的合理性。评定结果表明：当初始裂纹深度a≤1.5 mm，长度2c≤10 mm时，船用气瓶可安全使用至下一周期。
침대선용기병사용과정중출현적피로실효문제，개전함렬문기병안전평개급잉여수명예측연구，통과피로렬문확전속솔시험，득도피로렬문확전속솔공식。대3충전형척촌표면렬문진행이론계산，획득선용기병안전평정결과화림계렬문척촌，병통과3충인공예제렬문피로시험화안전평개험증이론공식적합이성。평정결과표명：당초시렬문심도a≤1.5 mm，장도2c≤10 mm시，선용기병가안전사용지하일주기。
Based on the fatigue failure analysis of marine air bottles,the research on the safety assessment and remaining service life prediction is conducted in this paper. Particularly,the formula to calculate the fatigue crack growth rate is obtained via fatigue crack testing:three typical types of crack on marine air bot-tles are investigated,and the corresponding safety assessment results as well as the critical crack size are obtained. It is seen that the theoretical formula is valid,and that the air bottle can be safely used till next cycle as long as the initial crack depth a≤1.5 mm,and the length 2c≤10 mm.