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Question 1 Damage in composites 1.1 A unidirectional E-glass/epoxy composite plate having a central through thickness crack of length 3a is subjected to a uniaxial stress o, as shown in the figure below. The unidirectional fibres are oriented at an angle a with respect to the direction of the crack, where a is in radians. The model fracture toughness of the composite Kica, varies with the angle a according to the empirical equation. ΚΚΙΠΙΙΙΙ = [0.739αα2 + 0.19αα + 1]ΚΚΙΙΙΙΟ, where KKIINO = 1.47 MPa m1/2 is the fracture toughness at the angle aa = 0 (i.e. when the crack is parallel to the fibre direction). The applied stress is oo = 150 MPa. Crack 2a Elliptical zone assumed to be relaxed due to presence of crack Figure1: Griffith crack: A through-thickness crack in a uniaxially stressed plate of infinite width (Gibson 2016) Determine the critical size x for the cases, where the crack is (i) perpendicular to the fibres and (ii) parallel to the fibres (10) 1.2 Discuss the interfacial sliding mechanisms in the following 1.2.1 PMC's (2) 1.2.2 SFC's (2) (14) ཁྱེེ Question 2 Fatigue of composites 2.1 Discuss the three regions of fatigue life diagram for MMC's 2.2 Mention at least two benefits of fatigue life diagrams (6) (4) [10] Question 3 Design of composites 3.1 When designing composites, these a couple of design objectives which need to be taken into consideration. List five specific application requirements which are included (5) 3.2 What is the safety factor values which must be taken into consideration. List five safety factors (5) 3.3 What are the advantages and disadvantages of fabrics composites (6) EMT3701 Assignment no.2 2022 [16] Question 4 Non-destructive testing of composites 3.1 What is the purpose of non-destructive testing in composites 3.2 Briefly explain the process of X-Radiography 3.3 Give at least three inhomogeneity factors that can affect composites performance 3 of 4 (3) (4) (3) [10] Total: 50