By Karl U. Kainer

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3 Mechanism of Reinforcement the stress–strain behavior of fiber composite materials with a ductile matrix, whose tensile strength is larger than of the fibers itself (according to Fig. 12) is shown. Above the critical fiber content ÖF,crit the behavior is affected considerably by the fiber. On reaching the fiber strength a simple brittle failure develops and the composite material fails. For composite materials with a brittle matrix, where no hardening arises and where the elongation to fracture is smaller than those of the fibers, the material fails on reaching the strength of the matrix below the critical fiber content (see Fig.

46a), pulled out fibers are sporadically visible. For the case of very good adhesion of the matrix on the fiber no delamination (Fig. 44c) occurs. The crack opens up due to the tensile stress and the matrix deforms, due to the good adhesion the fiber is fully loaded and malfunctions. During further load the matrix continues to deform above the fiber fracture area also, thus the fiber is further loaded above and below the separation and malfunctions in further fragments. Macroscopically a brittle failure without pulling out of fibers (Fig.

066 mm3; **CTE = thermal expansion coefficient, (a) after ASTM E-399 and B-645; (b) after ASTM E-23). 015 Wear* volume decrease (mm3) Properties of aluminum wrought alloy composites. Manufacturers instruction after [11, 12, 18–20]. 066 mm3; **CTE = thermal expansion coefficient). Tab. 9. An example of the successful use of aluminum composite materials within this range is the partially shortfiber reinforced aluminum alloy piston in Fig. 59, in which the recess range is strengthened by Al2O3 short fibers.

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