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我个人认为结构的损伤如下定义比较合理:
Damage in engineering systems is defined as intentional or unintentional changes to the material and/or geometric properties of these systems, including changes to the boundary conditions and system connectivity, which adversely affect the current or future performance of that system. All damage begins at the material level and, under appropriate loading scenarios, progresses to component and system level failure at various rates. Damage can occur in different ways:
Gradually (e.g. fatigue, creep, corrosion);
Suddenly and predictably (e.g. aircraft landings, planned explosions in confinement vessels); or
Suddenly and unpredictably (e.g. foreign-object-impact on turbine blades, earthquake-induced damage in civilian infrastructure, or battle damage to military equipment).
同时,我还认为损伤应涵盖结构的强度、刚度、稳定性、耐久性及正常使用功能等的降低。
关于结构的健康监测如下解释供参考:
The process of implementing a damage detection strategy for aerospace, civil and mechanical engineering infrastructure is referred to as Structural Health Monitoring (SHM). The SHM process involves the observation of a system over time using periodically sampled dynamic response measurements from an array of sensors. The extraction of damage-sensitive features from these measurements and the statistical analysis of these features is then used to determine the current state of system health. For long term SHM, the output of this process is periodically updated information regarding the ability of the structure to perform its intended function in light of the inevitable aging and degradation resulting from operational environments. After extreme events, such as earthquakes or blast loading, SHM is used for rapid condition screening and aims to provide, in near real time, reliable information regarding the integrity of the structure.
希望与大家交流。 |
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