Microfractures produced by a laboratory scale hypervelocity impact into graniteDifferential strain analysis and scanning electron microscopy are employed to study the microcracks produced in a granite block by shock waves from a hypervelocity impact. The anisotropy of the pre-shock cracks appears to control the orientations of the microcracks. Over the range 2 to 20 kbar, total crack porosity proves to be linearly related to shock pressure. The effect of the peak shock pressure on the width and median closure pressure of the crack spectra is also investigated. The results of the microcrack study may be useful in interpreting lunar samples.
Document ID
19780057727
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Siegfried, R. W., II (Corning Glass Works Corning, N.Y., United States)
Simmons, G. (MIT Cambridge, Mass., United States)
Richter, D. (Rock of Ages Corp. Barre, Vt., United States)
Hoerz, F. (NASA Johnson Space Center Geology and Geophysics Branch, Houston, Tex., United States)