Abstract: An analytical track-soil interaction model has been developed for the determination of maximum soil thrust. The model assumes rigid track geometry characterized by the dimensions of the main ground contact area and the approach angle. The position of the track is defined by its trim angle and sinkage at the front. Limits of interface stresses are determined by assuming soil failure in either the longitudinal or transverse direction. Within these limits adjustments are made to meet the requirement of moment equilibrium about the CG. The maximum soil thrust is determined by the interface stress distribution that satisfies equilibrium and allows the development of the highest interface friction angle. Results of parametric analyses obtained by the model regarding the effect of rack length/width ratios and CG locations on acceleration performance are shown. A semi-rigid track-tire interaction model has also been developed. This model shows that in soft soil the acceleration performance of pin-jointed tracks is governed by the interaction of the soil beneath the last roadwheel and the most rearward track links. Several concepts, aimed at improving the acceleration performance of tracked vehicles, are presented. Turning resistances comprise shear resistances arising at the track-soil interface and passive earth resistances arising at the side faces of tracks. These are analyzed and methods are presented for their computation.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Description: |
Final rept. |
| Pages: |
68 |
| Report Date: |
JUL 1978 |
| Contract Number: |
DAAE0775C0066 |
| Report Number: |
A620850 |
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