Download or read book Survey of Relative Hardness of Selected Impact Areas, Yuma Proving Ground, Arizona written by Adam A. Rula and published by . This book was released on 1977 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yuma Proving Ground was visited to conduct a survey of the relative hardness of selected impact areas to establish the most suitable sites for a survivability test as part of DT II testing of 155mm XM718/741 Remote Anti-Armor Mine System (RAAMS). Soil/terrain data were collected at Z, R, Cain, and Adam Fields located along the north side of Poleline Road. Z and R Fields were located on nearly level, moderately dissected gravelly piedmont which had recently been graded and compacted to achieve a high strength within the compacted layer. Cain Field is located on a wash. The area is undulating and bare. Adam Field is located on predominantly gravelly undissected piedmont with some wash areas. The area is undulating and the brush vegetation was removed. The surface materials at the four impact areas visited are predominantly coarse-grained soils with some areas having large amounts of gravel and caliche. The soil was slightly moist and firm when sampled. The cone index ranged from 300 to 500 in the 0- to 6-in. layer, and the dynamic cone penetrometer blows per foot for the surface 12 in. ranged from 17 to 34. A comparison of calculated peak rigid body deceleration-impact velocity relation for selected surface materials revealed that the magnitude of the rigid body g forces that the RAAM can experience upon impact with various earth materials varies considerably.