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1 Fretting corrosion is primarily a surface damage phenomenon occurring as a result of small cyclic movements between two materials caused by cyclic loading. Fretting damage can occur in vacuum, although it then would be better to speak of fretting, rather than fretting corrosion.
Stress crazing, which appears as an area of tiny micro-cracks, occasionally shows up in areas on the surface of. most thermoplastic sheets. This phenomena, although rare and preventable, is known to occur in many types of. plastic sheet materials and occasionally shows up on the surface of thermoformed acrylic hot tubs. A study of stress crazing on acrylic surfaces and its potential causes was performed by Aristech Acrylics LLC. The purpose of this study was to become more knowledgeable of the phenomena and to generate useful information for our customers to assist them in producing high quality finished parts.