Physics and Mechanics of the Brittle - Ductile Transition (Collaborative Research)

PI将研究的物理和力学的 脆性-韧性转变和压力的影响， 温度、晶粒度和第二相含量对强度的影响 纯橄榄岩、石英岩和大理石。 强度和轴向， 在温度下进行试验期间，将测量体积应变 温度可达1300摄氏度，压力可达600兆帕， 目前，三台流体约束介质三轴试验机 available. 这些数据将用于确定 压力和温度对应变硬化，膨胀率， 和本地化过程。 蠕变试验和恒定 将进行应变率测试。 声发射测量 将在一些测试中进行，以获得 作为应变的函数的声事件。

The PIs will study of the physics and mechanics of the brittle-ductile transition and of the effects of pressure, temperature, grain-size, and second-phase content on the strength of dunite, diabase, and marble. Strength and axial and volumetric strain will be measured during tests at temperatures of up to 1300o C and pressures of up to 600 MPa in either of three fluid confining-medium, triaxial testing machines presently available. The data will be used to determine the effect of pressure and temperature on strain hardening, dilatation rates, and the localization process. Both creep tests and constant strain-rate tests will be done. Acoustic emission measurements will be made during some of the tests to obtain frequency of acoustic events as a function of strain.