Formable light weight composite material systems and methods
A composite material and lightweight technology, applied in the direction of chemical instruments and methods, electronic equipment, synthetic resin layered products, etc., can solve the problems of different performance and cost requirements, cost and performance requirements, etc.
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example 1
[0150] About 15 vol% of mild steel fibers having a diameter of about 4 to about 40 μm and a length of about 1 to about 10 mm and 85 vol% of a copolyamide consisting of about 50 wt.% nylon 6 and about 50 wt.% nylon 6,9 (the copolymer of The characteristics are: the elastic modulus measured according to ISO527-2 is about 300MPa, the melting point measured according to ISO11357 is about 130°C and the elongation at break measured according to ISO527-3 is about 900%.) Mixing to prepare a filled thermoplastic polymer material . The filled thermoplastic is mixed at a temperature of about 190°C to about 250°C. The filled thermoplastic material is then placed between two mild steel sheets, each about 0.2 mm thick. Then, it is pressed at a temperature of about 200° C. to about 230° C. and a pressure of about 1 to about 22 MPa. The thickness of the filled thermoplastic core layer in the composite material is approximately 0.4 mm. The composites were punched under high speed punching o...
example 2
[0152] A composite material was prepared using the same materials, compositions and methods as in Example 1, except that mild steel fibers with a rectangular cross-section in a direction perpendicular to the length of the fibers were used in place of the fibers in Example 1.
[0153] The average length of the fibers is about 2.3 mm. The average cross-sectional area of the fibers is about 0.0045mm 2 . The width-thickness ratio of the fibers is about 2-8. The thickness of the composite material is about 0.8 mm. The composites were stacked with cold rolled steel samples having a thickness of approximately 0.8 mm. This combination is placed in a spot welder between a pair of welding electrodes approximately 13mm in diameter. A force of approximately 2.2 kNt was applied to the welding electrode. The through-thickness resistivity of the composite was measured under a force of 2.2 kNt. The resistivity of the composite of Example 2 was determined to be about 0.1 Ω·cm or less. ...
example 3
[0155] A composite was prepared using the same materials, compositions and methods as Example 1, except that the metal plate was replaced with a 0.2 mm thick high strength steel sheet having a yield strength of about 350 MPa, a tensile strength of about 460 MPa and an elongation of about 22%. The composite is expected to have a yield strength of about 193 MPa, a tensile strength of about 253 MPa, and an elongation of about 22%. The density of the composite was calculated to be approximately 34% lower than that of a monolithic mild steel plate of the same thickness (approximately 0.8 mm). The yield strength of the composite was calculated to be approximately 50 MPa or more higher than that of a monolithic mild steel sheet of the same thickness. The tensile strength of the composite is calculated to be at least about 90% of the tensile strength of a monolithic mild steel sheet of the same thickness. The flexural modulus of the composite material is calculated to be at least abo...
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