The interfacial failure sequence during fiber pushout in metal matrix composites

Mechanical testing of steel/aluminium–silicon interfaces by pushout

“…However, some authors relate the occurrence of bottom face debonding, in some cases for metal matrix composites (MMCs). [8][9][10] In the present study, bottom face debonding could be due to bending effect on the bottom face [11] or to thin slice geometry (thickness limited to less than 20 insert radii) [12].…”

Analysis on the interfacial shear strength of fiber reinforced titanium matrix composites by shear lag method

“…So it is necessary to use thin slices of composites to avoid the fracture of indenter or the crush of fiber [9]. Moreover, for almost all thin slice push-out tests of TMCs, it is observed that interface debonding initiates at the bottom face of the specimen due to thermal residual stresses at the interface [9][10][11][12][13]. This is different from interface debonding in ceramic matrix composites, whose debonding initiates at the top face.…”

“…However, there exists high bond strength and residual stresses at the interface of TMCs owing to the strong chemical activation of titanium and the mismatch of thermal expansion coefficients between fiber and matrix. So it is necessary to use thin slices of composites to avoid the fracture of indenter or the crush of fiber [9]. Moreover, for almost all thin slice push-out tests of TMCs, it is observed that interface debonding initiates at the bottom face of the specimen due to thermal residual stresses at the interface [9][10][11][12][13].…”

Micromechanical analysis of fiber and titanium matrix interface by shear lag method

“…For TMCs, there exists high bonding strength at the interface owing to the strong chemical activation of titanium. Thus it is necessary to use thin slices of composites to avoid the fracture of indenter or the crush of fiber [9]. Moreover, the higher thermal residual stresses are induced at fiber/matrix interface owing to the mismatch of thermal expansion coefficients between fiber and matrix.…”