Reliability Prediction for Composites Under Periodic Proof Tests in Service
Reliability Prediction for Composites Under Periodic Proof Tests in Service
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DOI：
10.1520/stp26949s
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发表时间：
1977
期刊：
影响因子：
--
通讯作者：
J. Yang
中科院分区：
文献类型：
--
作者：
J. Yang
提出了在使用中的定期验证测试下复合材料的探索性可靠性分析。复合材料的极限强度是一个随机变量。采用了复合材料在使用载荷下的残余强度退化模型。一旦统计使用载荷（例如阵风湍流和机动载荷）超过复合材料的残余强度，就会发生失效。同时，复合材料要接受定期验证测试，以消除薄弱部件并确保可接受的可靠性水平。当某个部件在验证测试中失败时，就会制造新的部件并进行验证测试以进行更换，从而使复合材料的强度得到更新。考虑到统计强度、强度退化特征、统计使用载荷、设计应力、定期验证试验以及更换引起的更新过程，得出复合材料在使用中失效的概率。研究了两个数值示例：战斗机的硼/钛粘合接头和运输型飞机的玻璃/环氧树脂部件。事实证明，通过应用定期验证测试可以显着提高复合材料的疲劳可靠性。
An exploratory reliability analysis of composites under periodic proof tests in service is presented. The ultimate strength of composites is a random variable. A residual strength degradation model for composites under service loads is employed. Failure occurs as soon as the residual strength of composites is exceeded by statistical service loads, for example, gust turbulence and maneuver loads. Meanwhile, the composites are subjected to periodic proof tests in order to eliminate weak components and ensure an acceptable level of reliability. When a component fails under the proof test, a new component is manufactured and proof-tested for replacement, so that the strength of composites is renewed. Taking into account the statistical strengths, strength degradation characteristics, statistical service loads, design stresses, periodic proof tests, and renewal processes due to replacement, the probability of composite failure in service is derived. Two numerical examples, a boron/titanium bonded joint of a fighter aircraft and a glass/epoxy component of a transport-type aircraft, are worked. It is demonstrated that significant fatigue reliability improvement for composites can be achieved by the application of periodic proof tests.