Lower Residual Limb for Prosthetic Socket Design - Computational Biomechanics of the Musculoskeletal System - page 158

Anterior view Posterior view

(MPa)

CPRESS

+ 2.577e - 01
+ 2.362e - 01
+ 2.147e - 01
+ 1.933e - 01
+ 1.718e - 01
+ 1.503e - 01
+ 1.288e - 01
+ 1.074e - 01
+ 8.590e - 02
+ 6.442e - 02
+ 4.295e - 02
+ 2.147e - 02
+ 0.000e + 00

228 kpa

258 kpa

164 kpa

199 kpa

(a)

(MPa)

CPRESS

+ 2.577e - 01
+ 2.362e - 01
+ 2.147e - 01
+ 1.933e - 01
+ 1.710e - 01
+ 1.503e - 01
+ 1.288e - 01
+ 1.074e - 01
+ 8.590e - 02
+ 6.442e - 02
+ 4.295e - 02
+ 2.147e - 02
+ 0.000e + 00

174 kpa

92 kpa

99 kpa

112 kpa

(b)

FIgure 13.4 (See color insert.) Contact normal stress distribution (a) with pre-stress considered and
(b) with pre-stress ignored upon application of 800 N.

Figure 13.5a shows the resultant shear stress distribution at the limb-liner interface when 800 N
was applied with pre-stress considered. The resultant shear stress is a combination of longitudinal
and circumferential components of shear stresses in the plane of the contact interface. High resul-
tant shear stresses were predicted at the four critical regions where socket undercuts were made. The
maximum value was 77 kPa over the anteromedial tibial region.