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Composites Crack pinning

Figure 4. SEM micrographs of epoxy/Al20 composite fracture surface (a) D230 AA18 50% and (b) crack pinning tails in DGEBA/D230 with 10% AA10 AI2O3. Figure 4. SEM micrographs of epoxy/Al20 composite fracture surface (a) D230 AA18 50% and (b) crack pinning tails in DGEBA/D230 with 10% AA10 AI2O3.
Additional dissipative processes arise from the presence of a secondary component in the polymer matrix or from interactions between the host polymer and the secondary particles. For a given polymer composite, there may exist inclusion cavitation, interfacial cavitation, particle deformation, and crack pinning by constituent particles. [Pg.158]

In the case of composite materials, several additional toughening mechanisms may also be present crack pinning by several closely spaced particles may... [Pg.739]

Fig. 7.12 (a) A schematic representation of the pinning of grain boundaries by whiskers, (b) An example of the process shown in (a) in the fatigue crack tip region of the alumina/SiC composite subjected to fatigue fracture at 1400°C. From Ref. 61. A refers to alumina grains. [Pg.251]

Standard Mode I Double Cantilever Beam specimens for delamination testing of a unidirectional (UD) IM7/977-2 composite were Z-pinned with two separate blocks of Z-Fiber reinforcement. The reinforced beam configuration was such as to provoke an unstable delamination, propagating between the two Z-pin blocks. Crack resistance curves for these specific geometry specimens of IM7/977-2 indicate that the unstable delamination cracks are arrested by the second Z-pin block, with the crack propagation resistance being dictated primarily by the Z-pinning density within a block. Acoustic emission analysis is used to interpret visual observations and other test data. [Pg.503]

Topchieva and Yun-Pin (170) found that in the mixed catalysts, AI2O3 + n Si02, of different composition catalytic activity for the cracking of cumene and that for the dehydration of alcohol do not run in parallel on pure AI2O3 cracking proceeds very weakly. Consequently, dehydration of alcohol does not depend on the acidic properties of alumina. [Pg.35]

Cartie DDR, Brunner AJ, Partridge IK. Effects of mesostructure on crack growth control characteristics in Z-pinned laminates. In Blackman BRK, Pavan A, Williams JG, editors. Fracture of polymers, composites and adhesives II. Elsevier 2003. pp. 503-14. http //dx.doi.org/10.1016/S1566-1369(03)80120-6. [Pg.226]


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