原文传递
Damage tolerance design procedures for an automotive composite
| 题名： | Damage tolerance design procedures for an automotive composite |
| 作者： | Battiste, R.L.;Corum, J.M.; |
| 关键词： | 36 MATERIALS SCIENCE ;33 ADVANCED PROPULSION SYSTEMS; MECHANICAL PROPERTIES; FIBERGLASS; AUTOMOBILES; IMPACT SHOCK; DAMAGE; DESIGN; EXPERIMENTAL DATA |
| 摘要： | Among the durability issues of concern in the use of composites in automobile structures is the damaging effects that low-energy impacts (e.g., tool drops and roadway kickups) might have on strength and stiffness. This issue was experimentally investigated, and recommended design evaluation procedures were developed for a candidate automotive structural composite--a structural reaction injection-molded polyurethane reinforced with continuous strand, swirl-mat E-glass fibers. Two test facilities were built to cover the range of impacts of interest--a pendulum device to characterize the effects of relative heavy objects at low velocities and an air gun to characterize the effects of relatively light objects at higher velocities. In all cases, the test specimen was a 9 x 9 x 1/8-in.-thick plate clamped on an 8-in.-diam circle. Sixty-five impact tests were performed. Included were tests using various impactor sizes and weights, tests at {minus}40 F, and tests on specimens that has been presoaked in water or exposed to battery acid. Damage areas were determined using ultrasonic C-scans, and the resulting areas were found to correlate with the quantity impactor mass to a power times velocity. A design curve was derived from the correlation and validated using dropped brick tests. To evaluate strength and stiffness reductions, the impacted plate specimens were cut into tensile, compressive, and fatigue test specimens that were used to determine reductions as a function of damage area. It was found that for design purposes, the strength reduction could be determined by representing the damage area by a circular hole of equivalent area. |
| 总页数： | 8p |
| 报告类型： | 科技报告 |
相关文献
- Demonstrating damage tolerance of composite airframes
- Durability-based design criteria for an automotive structural composite
- Durability-Based Design Criteria for an Automotive Structural Composite
- Durability-Based Design Criteria for a Quasi-Isotropic Carbon-Fiber-Reinforced Thermoplastic Automotive Composite
- Durability-Based Design Guide for an Automotive Structural Composite: Part 2. Background Data and Models
- Southern Regional Center for Lightweight Innovative Design. Final Scientific and Technical Report.
检索历史
应用推荐
