Contents: Modulus in Refractory Metals at Elevated Temperatures; Attenuation in Refractory Metals at Elevated Temperatures; Ferrite Stub Fixture; Momentary Contact High-Temperature Attenuation Measurement Equipment; Broadband Transducer Studies; Focused Transducer STudies; Flexural Modulus and Decrement Device for Measuring Plastics; Pulse-Echo-Overlap System for Ultrasonic Travel Time; Computer Programming.

The dynamic elastic moduli of 40 metals and ALLOYS OF ENGINEERING INTEREST HAVE BEEN DETERMINED AT ROOM AND ELEVATED TEMPERATURES. Modulus determinations were based upon a relation between the speed of sound in a material and its elastic modulus. A specimen of the material was excited electrostatically and its resonant frequency determined. Knowing the geometry of the specimen, the dynamic elastic modulus was calculated. Room temperature comparisons of dynamic with static moduli were made in most instances using material from the same bar. The results of dynamic elastic modulus determinations are graphically presented.

Insight into a material s high temperature mechanical and microstructural properties can be gained from knowledge of its elastic moduli. For a single-crystal material, the elastic modulus, C(sub ijkl), provides information on the strain (Epsilon sub kl) - stress (sigma sub ij) relationship given by sigma sub ij = C(sub ijkl) dot Epsilon sub kl. This relationship shows that, for a given strain, a large elastic modulus will induce a large stress in the material. In regards to mechanical properties, the crystallographic axis with the largest elastic modulus is the most likely for failure to occur. Before any IR transparent material can be considered for application in a high stress environment, such as IR dome applications, the elastic moduli must be known. Laser-based ultrasonics provides a non-contact, non-destructive means of measuring the elastic moduli of IR transparent materials in an elevated temperature environment. In this paper, the application of laser ultrasonics to IR materials characterization is reviewed. Specific calculations for determining the elastic moduli for isotropic and trigonal crystal symmetries, as exhibited by single-crystal sapphire, are presented. Measurements of the elastic moduli as a function of temperature for borosilicate glass and fused silica, elastically isotropic materials, are presented. In addition, a room-temperature ultrasonic measurement of germanium (Ge), an elastically anisotropic material, is shown.

Rock physics encompasses practically all aspects of solid and fluid state physics. This book provides a unified presentation of the underlying physical principles of rock physics, covering elements of mineral physics, petrology and rock mechanics. After a short introduction on rocks and minerals, the subsequent chapters cover rock density, porosity, stress and strain relationships, permeability, poroelasticity, acoustics, conductivity, polarizability, magnetism, thermal properties and natural radioactivity. Each chapter includes problem sets and focus boxes with in-depth explanations of the physical and mathematical aspects of underlying processes. The book is also supplemented by online MATLAB exercises to help students apply their knowledge to numerically solve rock physics problems. Covering laboratory and field-based measurement methods, as well as theoretical models, this textbook is ideal for upper-level undergraduate and graduate courses in rock physics. It will also make a useful reference for researchers and professional scientists working in geoscience and petroleum engineering.