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Testing standards
Integrating Fastener and Bolted Joint Testing with Analysis for Product Design
Testing underpins the fastener supply chain, from the fastener manufacturer’s basic fastener product performance and specification tests to the end-user Design Engineer’s bolted joint test rig and product testing. But testing in isolation has little value for fastener manufacturers, distributors and downstream original equipment manufacturers (OEMs). Design Engineers are increasingly…
Testing standards
Dynamic vibration testing of fasteners: theory, applications, international standards and recommendations
Abstract. Vibration can be desirable, such as when it is used to make music. More often, however, vibration is undesirable. It can introduce stress into mechanical systems and create fatigue that decreases service life. It can also loosen fasteners. This article discusses the root causes of the self-loosening of fasteners,…
Testing standards
How threaded fasteners self-loosen
What happens when fasteners become loose and how to prevent it? Fasteners self-loosening is the result of a combination of causes. Materials relaxation and embedding reduce the preload in bolted joints, in turn allowing vibration to initiate repeated transverse movement in the joint. Fasteners will come loose and fail, leading…