Fracture Mechanics of Metals, Composites, Welds, and Bolted by Bahram Farahmand

By Bahram Farahmand

In the initial degree of designing new structural to accomplish a given venture in a fluctuating load atmosphere, there are numerous components that the dressmaker should still examine. alternate reports for various layout configurations will be played and, in keeping with energy and weight concerns, between others, an optimal configuration chosen. the chosen layout needs to face up to the surroundings in query with out failure. as a result, a accomplished structural research that involves static, dynamic, fatigue, and fracture is important to make sure the integrity of the constitution. Engineers should also examine the feasibility of fabricating the structural within the fabric choice method. in past times few many years, fracture mechanics has develop into an important self-discipline for the answer of many structural difficulties within which the survivability of constitution containing pre-existing flaws is of significant curiosity. those difficulties contain structural disasters caused by cracks which are inherent within the fabric, or defects which are brought within the half as a result of unsuitable dealing with or tough machining, that needs to be assessed via fracture mechanics concepts.

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Additional resources for Fracture Mechanics of Metals, Composites, Welds, and Bolted Joints: Application of LEFM, EPFM, and FMDM Theory

Example text

The main development and application of fracture mechanics to structural parts took place in the USA at the Naval Research Laboratory (NRL) in 1950 under Professor George R. Irwin [28]. 25 Fracture mechanics became an engineering discipline following the development of Linear Elastic Fracture Mechanics (LEFM). The characterization of crack tip stresses when applying the LEFM concept requires the use of a stress intensity factor parameter, K, which can address important cracking problems in many industries where the safety of people and structure is of utmost concern.

Fracture mechanics analysis assumes the existence of a maximum flaw size in the part that grows in a stable manner during its service life. NDI provides the assurance that a flaw larger than the identified maximum size does not exist in the part. From a safety perspective, the initial assumed crack lengths provided by the NDI methods are larger than any pre-existing flaw that could be present in the structure after inspection. However, the degree of conservatism as a result of the larger initial crack size assumption (used to evaluate the life) must be realistic enough not to impact the structural weight or cause unnecessary rejection of parts.

Some limitations regarding the magnetic inspection method are: 1) success of this method is directly -- Applied Current Applied Current Field Circular Cylinder Circumferential Crack Longrtudinal MagnetIC Field Figure 28: Surface and near surface discontinuities cause variations in the magnetic field related to the skill of the inspector, 2) the procedure is only applicable to ferromegnetic material, 3) the depth of inspection is limited to surface and subsurface defects only as opposed to internal flaws.

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