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首页> 外文会议>Symposium on Methods for the Assessment of Structural Integrity of Components and Structures; 20010425; Cambridge; GB >Current Concepts and Future Needs for the Assessment of the Integrity of Components and Structures
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Current Concepts and Future Needs for the Assessment of the Integrity of Components and Structures

机译：组件和结构完整性评估的当前概念和未来需求

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摘要

The paper first describes the overall aim of engineering enterprises, emphasising the role that structural integrity has to play, both in the design and construction of new plant and in the assessment of existing plant, either for continuing operation or for plant life extension. The technical basis for structural integrity assessment relates to the parameters of stress, defect size and the material's resistance to crack extension. Critical concepts in each of these areas are reviewed and suggestions for further development are made. Attention is drawn to resonance, and to secondary stresses, residual stresses, stress-relaxation and high-temperature stress/strain fields. Issues concern the ability of such stresses to continue to provide driving-force as a crack extends. Comments are made on the resolution and scheduling of non-destructive inspections, on the sources of common defects in materials, and on how fatigue life may be assessed for components which contain residual stress as a result of surface treatment. Mechanisms of monotonic and fatigue failure in metallic alloys are summarised, and attention is paid to the analysis of scatter in properties. Damage induced by in-service operation is described. The necessity to follow operational rules and maintenance schedules is emphasised throughout the paper and thoughts on future applications of condition monitoring are offered. It is recognised that the technical case is part of a broader safety culture and that the ultimate success of an enterprise incorporates a range of 'human factors'.
机译：本文首先描述了工程企业的总体目标，强调了结构完整性在新工厂的设计和建造以及现有工厂评估（无论是持续运营还是延长工厂寿命）中必须发挥的作用。结构完整性评估的技术基础与应力，缺陷尺寸和材料的抗裂纹扩展性有关。对每个领域的关键概念进行了审查，并提出了进一步发展的建议。注意共振，以及次级应力，残余应力，应力松弛和高温应力/应变场。问题涉及这种应力随着裂纹扩展而继续提供动力的能力。对非破坏性检查的解决方案和计划，材料中常见缺陷的来源以及如何评估因表面处理而包含残余应力的组件的疲劳寿命进行了评论。总结了金属合金的单调疲劳破坏机理，并着重分析了性能的分散性。描述了在役操作引起的损坏。整篇论文都强调了必须遵循操作规则和维护计划，并提供了有关状态监测未来应用的想法。公认的是，技术案例是更广泛的安全文化的一部分，企业的最终成功包含了一系列“人为因素”。

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