Claims
- 1. A two-layer composite structure comprising:a structural material; a voltage generating material formed of a ferroelectric material, a pyroelectric material, or a piezoelectric material, which is bonded to said structural material and which generates a voltage in accordance with an impact force applied to said structural material; and an electrode, connected to said structural material and said voltage generating material, which detects cracks in said structural material by detecting said voltage generated by said voltage generating material.
- 2. A two-layer composite structure according to claim 1, wherein said structural material is a metal, a ceramic, or glass.
- 3. A two-layer composite structure according to claim 2, wherein said structural material is reinforced by ceramic fibers or whiskers.
- 4. A two-layer composite structure according to claim 1, wherein said structural material is a conductive ceramic material, and the voltage generating material is perovskite type, wurtzite type, or a ZnO type material.
- 5. A two-layer composite structure according to claim 4, wherein said structural material comprises a conductive ceramic material and is used as an electrode for detecting cracks.
- 6. A two-layer composite structure according to any of claims 1-5, wherein said structural material and said voltage generating material are bonded together via an adhesive agent.
- 7. A two-layer composite structure according to any of claims 1-5, wherein a thin film of said voltage generating material is bonded to said structural material.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-276145 |
Oct 1993 |
JP |
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Parent Case Info
This application is a Continuation-in-Part Continuation Division of application Ser. No. 08/319.003, filed on Oct. 6, 1994, now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
08/319003 |
Oct 1994 |
US |
Child |
08/705063 |
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US |