| 摘要 |
A toe cap (20) is a reinforcement member made of thermoset structural composite material with a tensile strength of 30,000 psi, a tensile modulus of 2.5xl0<6> psi, a compression strength of 5,800 psi, a specific gravity of 1.85, and a Barcol hardness of 65. More preferably, the material has a tensile strength of at least 50,000 psi, a tensile modulus of at least 3.8x10<6> psi, a compression strength of at least 42,000 psi, a specific gravity of at least 1.90, and a Barcol hardness of at least 70. A suitable family of materials is a thermoset vinyl ester based sheet molding compound reinforced with glass fiber and/or carbon fiber. The sheet molding compound has fiber content of about 63 % and a typical fiber length of one inch. The maximum wall thickness of the upper portion (22) of the toe cap is in the range of between 0.100 inch and 0.250 inch.
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