利用超声波技术并辅以电测法，对两组不同开口深度混凝土缺口梁的损伤断裂特性进行了试验研究。
It is conducted an experimental study on the damage and fracture characteristics of notched concrete beams with two groups of different depths by ultrasonic technology with strain gauge technique.
用断裂韧度、缺口冲击试验评定钢的脆性倾向。
The brittleness tendency of steel has been assessed with fracture toughness and notch impact tests.
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