为研究动态断裂及破碎的温度敏感性的方法

Overview

This study presents a method for investigating dynamic fracture and fragmentation of materials under high strain rates and varying temperatures. Utilizing a gas gun-driven expanding cylinder, the technique allows for precise control over loading conditions.

Key Study Components

Area of Science

• Dynamic fracture mechanics
• Material science
• High strain rate testing

Background

• Fracture and fragmentation occur during dynamic loading scenarios.
• Traditional studies often utilize explosives for such investigations.
• Understanding these phenomena is crucial for material design and safety.
• Temperature effects on material behavior are significant in dynamic loading.

Purpose of Study

• To develop a method for studying dynamic fracture and fragmentation.
• To control sample temperature during high strain rate testing.
• To analyze the effects of temperature on fracture mechanisms.

Methods Used

• Gas gun driven expanding cylinder geometry for testing.
• Hollow cylinder samples with a steel O jive shaped insert for temperature control.
• Laser-based diagnostics for measuring expansion velocity.
• High-speed imaging to track fracture initiation and growth.

Main Results

• Successful control of sample temperature during dynamic loading.
• Measurement of expansion velocity at multiple points along the cylinder.
• Observation of deformation failure and fragmentation characteristics.
• Analysis of fracture mechanisms related to temperature variations.

Conclusions

• The method provides insights into dynamic fracture behavior under controlled conditions.
• Temperature significantly influences fracture mechanisms and material response.
• This technique can enhance understanding of material performance in dynamic scenarios.

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