Lifetime estimates for time-dependent properties of materials

Harold B. Liemohn; Sam A. Denham; E. C. McKannan

doi:10.1117/12.213558

7 July 1995 Lifetime estimates for time-dependent properties of materials

Harold B. Liemohn, Sam A. Denham, E. C. McKannan

Proceedings Volume 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials; (1995) https://doi.org/10.1117/12.213558
Event: Nondestructive Evaluation of Aging Infrastructure, 1995, Oakland, CA, United States

Abstract

A time-dependent term is introduced into the Arrhenius rate equation to refine the lifetime projections for materials that do not satisfy the linearity assumptions of the theory. This new term describes those materials where properties decay exponentially during the early phase of their exposure to elevated temperatures and subsequently equilibrate to almost constant values. The method is applied to the acoustic-absorber polyimide foam, `Solimide,' resulting in lifetime predictions for specific strength that are believed to be more accurate and reliable than predictions with the linear theory. Furthermore, the entire data set was included in a single nonlinear regression method which assured an orderly temperature dependence and smoothed out uncertainties in the measurements.

Citation Download Citation

Harold B. Liemohn, Sam A. Denham, and E. C. McKannan "Lifetime estimates for time-dependent properties of materials", Proc. SPIE 2455, Nondestructive Evaluation of Aging Aircraft, Airports, Aerospace Hardware, and Materials, (7 July 1995); https://doi.org/10.1117/12.213558

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Temperature metrology

Foam

Defense and security

Error analysis

Numerical analysis

Acoustics

Chemical reactions

Show All Keywords

Keywords/Phrases

Search In:

Publication Years