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Crack closure is a phenomenon in fatigue loading, where the opposing faces of a crack remain in contact even with an external load acting on the material. As the load is increased, a critical value will be reached at which time the crack becomes open .
It uses methods of analytical solid mechanics, structural engineering, safety engineering, probability theory, and catastrophe theory to calculate the load and stress in the structural components and analyze the safety of a damaged structure. There is a direct analogy between fracture mechanics of solid and structural fracture mechanics:
A Griffith crack (flaw) of length is in the middle [3] [4] an infinity large material. Fracture mechanics was developed during World War I by English aeronautical engineer A. A. Griffith – thus the term Griffith crack – to explain the failure of brittle materials. [5] Griffith's work was motivated by two contradictory facts:
There are three mechanisms acting in thermo-mechanical fatigue Creep is the flow of material at high temperatures; Fatigue is crack growth and propagation due to repeated loading; Oxidation is a change in the chemical composition of the material due to environmental factors. The oxidized material is more brittle and prone to crack creation.
Cape Peninsula University of Technology (Afrikaans: Kaapse Skiereiland Universiteit van Tegnologie) is a university in Cape Town, South Africa. It is the only university of technology in the Western Cape province, and is also the largest university in the province, with over 32,000 students. It was formed by merging the Cape Technikon and ...
Marks' Standard Handbook for Mechanical Engineers is a comprehensive handbook for the field of mechanical engineering. Originally based on the even older German Hütte, it was first published in 1916 by Lionel Simeon Marks. In 2017, its 12th edition, published by McGraw-Hill, marked the 100th anniversary of the work. The handbook was translated ...
The terms are used in forensic engineering and structural engineering when analysing product failure. Failure may occur because either the product is weaker than expected owing to a stress concentration , or the applied load is greater than expected and exceeds the normal tensile strength , shear strength or compressive strength of the product.
The Department of Mechanical Engineering is responsible for teaching and research in mechanical engineering at Imperial College London, occupying the City & Guilds Building at the South Kensington campus. The department has around 45 faculty members, 600 undergraduates, and 250 postgraduate students.