http://cecs.boardeducation.net/machine-element-design-forum-f8/-t1.htm Sat, 02 Jan 2010 06:42:37 GMT 10 http://illiweb.com/fa/m/logo1.gif http://cecs.boardeducation.net/machine-element-design-forum-f8/-t1.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm Admin We have seen that failure of a tensile member occurs when the stress caused by the actual load reaches the stress limit - the strength - of the member's material. Correlation of the actual stress with the maximum stress (strength) is straightforward in this case because they are both uniaxial. But how can we correlate the triaxial stress state in a component - whose material strength(s) is measured in uniaxial tests - to assess failure tendency? Unfortunately there is at present no fundamental ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:42:37 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm#54 http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm Admin We refer to tension, shear, bending and torsion as elementary load building blocks because the loading which is applied to most components is a combination (superposition) of these four - for example, a rotating shaft which transmits power is subjected not only to torsion, but usually also to bending and to direct shear. The similarities and differences between the load building blocks are illustrated here. This first example applies the building blocks to the analysis of a bent cantilever. ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:37:21 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm#53 http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm Admin We shall use a tightened nut and bolt, in which the detailed stress variation is extremely complicated, to illustrate some of the simplifying assumptions which are usually made in routine analysis and design. The leftmost sketch below shows an assembly comprising a nut and bolt which fasten two components together. The nut and bolt pair can be regarded as a sub-assembly or component in its own right. Before any identification of the stresses can be attempted, all external effects on this ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:33:35 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm#52 http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm Admin You are walking in the countryside when you come across a creek which is too wide to jump. Problem: How can you cross to the far side without a soaking? Applying creativity, you may come up with the following possible solutions, depending upon the circumstances :- roll up your jeans and wade across dam the creek adapt a couple of tent-poles as stilts to walk dry-shod through the creek bend a sapling, secure it with a rope, climb the sapling, cut the rope and catapult across construct ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:25:38 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm#51 http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/introduction-of-machine-design-t10.htm Admin DESIGN What is Design?; why do we design ?; how do we design - problem statement, creating a bank of solution candidates, constraints & criteria, practicalising the candidates, evaluating the candidates, the feasibility study; where do we go from here?; more advanced considerations. Appendices - an improvement problem; analysis of a spring driven vehicle; springs as energy stores; extract from JCH Roberts, Creativity. STRESS, STRENGTH AND SAFETY Safety factor; stress concentration; ... MACHINE ELEMENT DESIGN FORUM Mon, 26 Oct 2009 12:45:33 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/introduction-of-machine-design-t10.htm#11 http://cecs.boardeducation.net/machine-element-design-forum-f8/introduction-of-machine-design-t10.htm