In theories of failure most conservative theory is
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When a component is subject to increasing loads it eventually fails. It is comparatively easy to determine the point of failure of a component subject to a single tensile force. The strength data on the material identifies this strength. However when the material is subject to a number of loads in different directions some of which are tensile and some of which are shear, then the determination of the point of failure is more complicated...
Metals can be broadly separated into DUCTILE metals and BRITTLE metals. Examples of ductile metals include mild steel, copper etc . Cast iron is a typical brittle metal.
Ductile metals under high stress levels initially deform plastically at a definite yield point or progressively yield. In the latter case a artificial value of yielding past the elastic limit is selected in lieu of the yield point e.g 2%proof stress. At failure a ductile metal will have experienced a significant degree of elongation.
Brittle metals experience little ultimate elongation prior to failure and failure is generally sudden.
A ductile metal is considered to have failed when it has suffered elastic failure, that is when a marked plastic deformation has begun. A number of theories of elastic failure are recognised including the following:
Maximum principal stress theory ..... Can be used - with caution for brittle metalsMaximum shear stress theoryDistortion energy theory.....Favoured for ductile metalsConstant distortion energy theory
Metals can be broadly separated into DUCTILE metals and BRITTLE metals. Examples of ductile metals include mild steel, copper etc . Cast iron is a typical brittle metal.
Ductile metals under high stress levels initially deform plastically at a definite yield point or progressively yield. In the latter case a artificial value of yielding past the elastic limit is selected in lieu of the yield point e.g 2%proof stress. At failure a ductile metal will have experienced a significant degree of elongation.
Brittle metals experience little ultimate elongation prior to failure and failure is generally sudden.
A ductile metal is considered to have failed when it has suffered elastic failure, that is when a marked plastic deformation has begun. A number of theories of elastic failure are recognised including the following:
Maximum principal stress theory ..... Can be used - with caution for brittle metalsMaximum shear stress theoryDistortion energy theory.....Favoured for ductile metalsConstant distortion energy theory
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Explanation:
The most conservative theory is *
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