A Simpler Way to Predict Bolt Preload  

Oleh:

Lee, Moo-Zung

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 7 (Apr. 2011), page 53-58.
Topik: Design Engineering; Tensile Strength; Shear Stresses; Stress State; Joining; Production Methods; Guidelines

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.64 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Engineers must frequently calculate the bolt preload torque needed to securely hold parts together without overstressing joints. They mainly rely on torque equations and torque tables, time-consuming tools that were developed more than a half-century ago. This article presents a user-friendly alternative. Applied torque concurrently produces both tensile and shear stresses in a bolt. Conventional methods combine tension and shear stresses into an equivalent stress and compare it with material strength. A general notion is that if this equivalent stress reaches the material strength, the part fails. The maximum distortion energy criterion of failure stipulates that inelastic failure occurs when von Mises stress approaches the material yield stress. For most bolt materials, von Mises stress criteria applies. Determine the theoretical upper bound of clamping capability by pushing von Mises stress at assembly to the yield stress of the material. For lower-strength materials, the maximum shear-stress failure criterion applies. It's good practice to limit preload to provide an adequate margin of safety.

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