An example of abet accreditation practice of mechanical engineering program at UAE university

This paper focuses on the Mechanical Engineering Program (MEP) at United Arab Emirates University (UAEU) as a case study in terms of consistent accreditation by the internationally recognized Accreditation Board for Engineering and Technology, Inc. (ABET), where significant proportions of the study give attention towards the recent records of accreditation; granted in 2016. The paper describes the program educational objectives (PEOs), the student learning outcomes (SOs), and the curriculum, direct and indirect assessment tools of the SOs and it’s mapping to the PEO, and the level of attainment achieved is addressed through a case study example

CRITERION FOR MIXED-MODE STABLE CRACK-GROWTH .2. COMPACT TENSION GEOMETRY WITH AND WITHOUT STIFFENER

Stable crack growth in mixed mode through doubly stiffened and unstiffened compact tension (CT) specimens of D16AT aluminium alloy has been studied theoretically and experimentally. Theoretical study is based on an elastic-plastic finite element scheme based on the small deformation theory of incremental plasticity. The plastic wakes have been obtained by the chemical etching method. The finite element results include load-displacement diagrams, plastic zones, crack edge profiles, J integrals, etc. Comparisons with experimental results have been presented in some cases. The agreement is generally good. The crack growth at every stage appears to be governed by the COA criterion

Mode II stable crack growth

Mode II stable crack extension has been examined for an aircraft grade aluminium alloy D16AT. Both theoretical and experimental results are presented. The experimental observations include load displacement diagrams, plastic wake, crack front tunnelling and scanning electron micrographs of the fracture surfaces. The crack shows a tendency for in-plane extension, and the fracture surface is very Bat, smooth and free of any dimples. The crack front advances with negligible tunnelling at all stages of extension. The span of mode II stable crack growth (SCG) is longer than in the case of mode I SCG reported earlier for the same material and there is also more extensive plastic deformation. In the presence of a slight mode I load, the crack grows out-of-plane and the fractured surface facets resemble that of a mode I or mixed-mode dimpled fracture. The theoretical study is based on a finite element analysis using small deformation theory and incremental plasticity. Some of the experimental results have been theoretically predicted using the COA criterion as the governing criterion. The theoretical results include load-displacement diagrams, crack edge displacement curves, plastic zones and the J resistance curves. There is good agreement between the load-displacement diagrams. The initiation and maximum loads differ by less than 15%. The J resistance curve has a constant slope over the whole span of stable crack growth

CRITERION FOR MIXED-MODE STABLE CRACK-GROWTH .1. 3-POINT BEND GEOMETRY

Stable crack growth in mixed mode through three point bend (TPB) specimens of D16AT aluminium alloy has been studied both theoretically and experimentally. Theoretical investigations are based on an elastic-plastic finite element scheme based on the small deformation theory of incremental plasticity. The crack edge profiles and the plastic wakes have been obtained by the replication method and the chemical etching technique respectively. The finite element results include load-displacement diagrams, plastic zones, crack edge profiles, J integrals, etc. Comparison with experimental results has been presented in some cases. The agreement is generally good. The crack growth at every stage appears to be governed by the crack opening angle (COA) criterion

MODE-I AND MIXED-MODE STABLE CRACK EXTENSIONS THROUGH STIFFENED 3-POINT BEND SPECIMENS

Both experimental and theoretical results on stable crack extensions are presented for symmetrically stiffened and unstiffened three point bend specimens subjected to mode I or mixed mode loading systems. Results concerning load-displacement variation, growth of plastic zones, instantaneous crack edge profiles, tunnelling, etc., are presented. There is good agreement between the experimental and theoretical results. The whole of stable crack growth can be characterized by the crack opening angle criterion. The stiffening helps to increase substantially both the initiation load and the maximum fracture load

Bilinear CTOD/CTOA scheme for characterisation of large range mode I and mixed mode stable crack growth through AISI 4340 steel

An investigation has been reported concerning characterisation of large span stable crack growth (SCG) through AISI 4340 steel in terms of CTOD/CTOA under both mode I and mixed (I and II) mode loadings. The characterisation has been possible through finite element analysis of published experimental results with compact tension type of specimens. As against the earlier observations by many investigators of a bilinear CTOD/CTOA variation, decreasing initially and constant later, characterising the crack growth through other materials, an increasing initially and constant later type of variation is found to be suitable for AISI 4340 steel. The same variation is found to characterise both mode I and mixed mode SCG. The starting value of CTOD/CTOA is 0.035 mm/0.0875 rad; the value at the later stages is 0.08 mm/0.20 rad. The same variation is found to predict accurate enough for engineering applications the initiation (P(i)) and maximum (P(max)) loads and the variation of load-cl is placement diagrams over a span of crack growth up to 10 mm. (C) 200