elasticity and fatigue strength for mapping purpose all types of natural or man made non electrically conducting fibers such as polyester nylon cotton silk wool may be used as insulation fibers the change of the electrical resistance of the fabric is caused by change of the resistance of the conductive yarn at the contacting points as shown in a representative fabric structure i e single warp knitted fabric in fig1 each of the pressure and or strain sensing fabrics of this invention is formed by a plurality of electrically conductive yarns each yarn as generally understood is basically a thread of material the yarns of the pressure and or strain sensing fabrics of this invention forms interlocking rings such that multiple contacting regions may be established among the yarns several different embodiments of such interlocking rings are described below it should be noted that the interlocking rings may be formed by one yarn or by several yarns in the fabric there are numbers of these contacting regions caused by the interlocking loops forming the fabric body different fabric structure constructs different distributions of these contacting regions in the fabric when a voltage is applied the fabric serves as an electrical conductor transmitting the currents along the yarns in the fabric which changes its resistance according to the magnitude of the load applied onto the fabric the fabric can be simulated by a pure resistive network comprising length resistance and contacting resistance relating the intrinsic resistance of the yarns and the contacting resistance of two contacting yarns at the contacting region respectively in fig2 ignoring the lateral contacts fig3 shows different patterns of interlocking rings formed by a single yarn as shown in fig3 different size of rings may be formed but the general.