Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

In a recent paper [1] a nonlinear method was suggested to evaluate adhesive joint quality and it was pointed out that nonlinear measurements are more directly correlated to mechanical strengths than linear ones. In that paper a new dynamic acousto-elastic measurement technique was introduced and shown to be sensitive enough to measure both first and second order nonlinearities at load levels of 15% of the ultimate strength. At this stress level special geometry of the adhesive joint sample is required in order to adopt the sample to a high power loading machine. Lower stress levels however can be generated by low frequency high power ultrasonic transducer which would replace the loading machine and make the technique truly a nondestructive one. The objective of this paper is to introduce a more sensitive measurement technique to measure both first and second order nonlinearities in a thin adhesive layer at stress level of 1–2% of the ultimate strength.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 7: Characterization of Materials

Section

Non-Linear Acoustic Properties

Pages

1845-1852

DOI

10.1007/978-1-4615-3742-7_92

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Higher Order Nonlinearity Measurement Techniques in Thin Adhesive Layer

La Jolla, CA

In a recent paper [1] a nonlinear method was suggested to evaluate adhesive joint quality and it was pointed out that nonlinear measurements are more directly correlated to mechanical strengths than linear ones. In that paper a new dynamic acousto-elastic measurement technique was introduced and shown to be sensitive enough to measure both first and second order nonlinearities at load levels of 15% of the ultimate strength. At this stress level special geometry of the adhesive joint sample is required in order to adopt the sample to a high power loading machine. Lower stress levels however can be generated by low frequency high power ultrasonic transducer which would replace the loading machine and make the technique truly a nondestructive one. The objective of this paper is to introduce a more sensitive measurement technique to measure both first and second order nonlinearities in a thin adhesive layer at stress level of 1–2% of the ultimate strength.