Title

Prediction of the Mechanical Response of a High Temperature Superalloy Rene 95

Date

1980

Index Abstract

Coming Soon

Photo Quality

Not Needed

Report Number

AFWAL TR 80-4184

Creator

Stouffer, D. C.

Papernik, L.

Bernstein, H. L.

Corporate Author

University of Cincinnati

Date Issued

1980-09-01

Extent

53

Identifier

ADA100290

Distribution Classification

1

Contract

F33615-78-C-5199

DoD Project

2307

DoD Task

2307P1

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Abstract

The mechanical response of Rene 95 at 650 C. (1200 F) is predicted by the three different theories. First, the state variable model by Bodner and his coworkers is examined. A method is developed to calculate the state variable history from the Rene 95 data. This leads to a new presentation for the state variable and a direct method to determine some of the material parameters. Second, it is found that creep and stress relaxation can be correlated with isochronous curves; thus, the theory of Rabotnov and Papernik is examined. The model is extended to cyclic histories and a representation is developed specifically for Rene 95. Third, the model developed by Laflen and Stouffer for another super alloy is extended to Rene 95. It is also used to predict reverse plastic flow developed during cyclic histories. All models were found to reproduce the stress-strain and creep response very well. The models were also used to predict the cyclic behavior and stress relaxation. In general it is found that none of the models can adequately predict phenomena arising from damage such as tertiary creep. The study is concluded with a point-by-point comparison of the models.

Report Availability

Full text available by request

Provenance

IIT

Type

report

Format

53 pages ; 28 cm.