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Damage detection via embedded sensory particles - Effect of particle/matrix interphase properties

机译:通过嵌入的感官颗粒进行损伤检测-颗粒/基质间相特性的影响

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Supported by recent studies, a crack interior to the host material will cause an especially strong stress concentration and thus can be detected by monitoring or sensing the localized changes in the magnetic properties of the particles in metallic composites. Using finite element analysis calibrated from the experiments, this work investigates the effects of material properties and thickness of the particle/matrix interphase on the phase transformation response of embedded sensory particles in the vicinity of a crack existing in the host matrix. Depending on the interphase elastic and cohesive properties, its thickness, and the operational temperature, which is known to delay or promote martensitic transformation, it is found that interphase damage may occur at stress levels lower than that needed to initiate phase transformation in MSMA particles. Such a response would mitigate the degree to which the particle transforms and reduces particle sensitivity. The effect of particle position relative to the crack tip on interphase damage and particle transformation response is studied via the full factorial design of experiments. To assess the true feasibility of the technique, the average change in magnetic permeability in the vicinity of the particle given constant applied magnetic and applied stress fields is evaluated.
机译:在最新研究的支持下,主体材料内部的裂纹将引起特别强烈的应力集中,因此可以通过监视或感测金属复合材料中颗粒的磁性能的局部变化来检测。使用通过实验校准的有限元分析,这项工作研究了材料特性和颗粒/基质间相的厚度对基质基质中存在的裂纹附近嵌入的感官颗粒的​​相变响应的影响。根据相间的弹性和内聚性,厚度和工作温度(已知会延迟或促进马氏体相变),发现相间破坏可能发生在应力水平低于在MSMA颗粒中引发相变所需的应力水平下。这样的响应将减轻粒子转变的程度并降低粒子灵敏度。通过全因子设计实验研究了相对于裂纹尖端的颗粒位置对相间损伤和颗粒转变响应的影响。为了评估该技术的真正可行性,在给定恒定施加磁场和施加应力场的情况下,评估了颗粒附近磁导率的平均变化。

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