Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

A quantitative assessment of a structure’s material characteristics contributes to the safety, reliability, and useful lifetime of a structure. Thermographic nondestructive evaluation has advantages over other methods in that it is a noncontacting, quantitative measurement of the material integrity which can inspect large areas in a short period of time. A disbond between layers of a laminated structure will prevent heat from penetrating from the surface layer to the subsurface layers and will result in an increase in temperature over the disbond. The limits of this technique for detection of disbonds in solid rocket motors was investigated by computational simulation of the thermographic technique. This has an advantage over an experimental investigation, since many sample configurations and flaw sizes can be investigated at a fraction of the cost and time required for sample fabrication, data acquisition and analysis. This paper presents a series of simulations varying parameters that affect the thermal contrast such as heating time, disbond size, and thickness of the surface layer. Experimental results are presented for comparison.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9B

Chapter

Chapter 7: Engineered Materials

Section

Adhesive Joints

Pages

1263-1270

DOI

10.1007/978-1-4684-5772-8_162

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Parametric Studies of Thermographic Detection of Disbonds in Laminated Structures Using Computational Simulations

Brunswick, ME

A quantitative assessment of a structure’s material characteristics contributes to the safety, reliability, and useful lifetime of a structure. Thermographic nondestructive evaluation has advantages over other methods in that it is a noncontacting, quantitative measurement of the material integrity which can inspect large areas in a short period of time. A disbond between layers of a laminated structure will prevent heat from penetrating from the surface layer to the subsurface layers and will result in an increase in temperature over the disbond. The limits of this technique for detection of disbonds in solid rocket motors was investigated by computational simulation of the thermographic technique. This has an advantage over an experimental investigation, since many sample configurations and flaw sizes can be investigated at a fraction of the cost and time required for sample fabrication, data acquisition and analysis. This paper presents a series of simulations varying parameters that affect the thermal contrast such as heating time, disbond size, and thickness of the surface layer. Experimental results are presented for comparison.