Stress transducer for fabrics and flexible sheet materials
First Claim
1. A transducer assembly for measuring stress in material, comprising transducer means mounted in an opening in said material and bonded substantially continuously about said opening such that said transducer means comprises an inclusion relative to said material for directly sensing stresses which develop therein.
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Accused Products
Abstract
A transducer assembly for monitoring stress in flexible sheet material, by responding directly to stress in the sheet and providing an electrical output which is related to the magnitude of biaxial stresses in the sheet. A transducer, for example of a suitable epoxy, is cast as an inclusion through which the stresses from the material are transferred. According to a preferred embodiment, a hole is made in the fabric material and the coating, if present, is removed from adjacent yarns about the edge of the hole to form an annular region to which the transducer then is securely bonded. If a non-yarn material is used then the epoxy is formed about the material per se. One or more electrical strain gages are affixed to the transducer, to directly sense stresses in the material which are transmitted to the transducer. In other embodiments the transducer is an integral part of a piece of sheet material which in turn is spliced into the overall material to be monitored.
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Citations
11 Claims
- 1. A transducer assembly for measuring stress in material, comprising transducer means mounted in an opening in said material and bonded substantially continuously about said opening such that said transducer means comprises an inclusion relative to said material for directly sensing stresses which develop therein.
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11. A method of monitoring stress in material subjected to stress comprising the steps of:
forming a transducer from an epoxy as an inclusion in said material whose stress is to be monitored, securely bonding said transducer near its periphery to said material in the vicinity of the edge surface defining an opening in which said transducer is located in said material and affixing at least one strain gage to said transducer.
Specification