抄録
The foot joint has the great mechanisms. One of them is its arch structure. This makes bipedal locomotion possible. However, the mechanism is not elucidated, so engineering research is required. Experimental analysis by a photoelasticity method was done in this research. It targeted the normal foot and the flatfoot. The change in the height of an arch was investigated. And, it was investigated about the influence of a tendon. All loads were static loading. The 3-dimensional experiment was done with the result of two dimensions as reference. The 3-dimensional stress freezing method was used. All the bones of the foot joint were made separately. This is a method good in the model experiment of a living body. First, it experimented by the frame model. It is for knowing the fundamental stress condition of a foot joint. Next, the model in consideration of a muscle and a tendon was made. It is because the influence of a tendon can be investigated by comparing with a frame model. The stress distribution map showed some things. In a normal foot of the Skelton model, the stress of a Calcaneus ground plane decreases outside. A flatfoot of the Skelton model has much more stress concentration. Change in an arch influences the load distribution. And, the tendon had big influence. If a tendon works, stress distribution will move a healthy foot. As for a flatfoot, a function of a tendon will decrease a stress value.
