Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: K. N. Lauraitis
Publisher:
Total Pages: 436
Release: 1981
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: K. N. Lauraitis
Publisher:
Total Pages: 334
Release: 1981
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume II. Tasks II and III.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume II. Tasks II and III.
Author: K. N. Lauraitis
Publisher:
Total Pages: 324
Release: 1981
Genre:
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume II. Tasks II and III. Book in PDF, Epub and Kindle

Contents: Overview of Tasks II and III; Material and Specimen Characterization -- Tasks II and III; Experimental Procedures; Static Tension and Compression Results; Task II Fatigue Results; Task III Fatigue Results; Damage Characterization; and Analysis of Results.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: D. E. Pettit
Publisher:
Total Pages: 344
Release: 1979
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of a three task program directed at the study of relationship between damage propagation and residual static strength of composite laminates. In Task 1: Preliminary screening, two laminates a 24-Ply 67% 0 deg. fiber and a 32-Ply quasi-isotropic laminate of T300/5208 graphite epoxy material were selected for study. Two damage types were studied, a low velocity impact condition (i.e., simulated tool drop) and a badly drilled hole. An initial study was conducted for each damage type to determine the detailed damage introduction parameters resulting in the selection of one set of impact and one set of poor drilling conditions. Baseline static tension and static compression tests were conducted on each of the four damage/laminate conditions. Stress vs life (S-N) fatigue data were then generated at range ratio R=-1 for each of the four conditions. The damage growth characteristics were monitored on each fatigue specimen using a modified Holscan ultrasonic unit. A subset of the damaged hole specimens was also evaluated in static compression and fatigue (R = -1) using TBE enhanced X-ray methods to monitor damage growth and to assess any detrimental effect of TBE on subsequent behavior of the damage. The results indicate significant reduction in initial static tension and compression strengths for the damaged hole condition in both laminates.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: K. N. Lauraitis
Publisher:
Total Pages: 379
Release: 1981
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: K. N. Lauraitis
Publisher:
Total Pages: 281
Release: 1981
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: D. E. Pettit
Publisher:
Total Pages: 227
Release: 1979
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of a three task program directed at the study of relationship between damage propagation and residual static strength of composite laminates. In Task 1: Preliminary screening, two laminates a 24-Ply 67% 0 deg. fiber and a 32-Ply quasi-isotropic laminate of T300/5208 graphite epoxy material were selected for study. Two damage types were studied, a low velocity impact condition (i.e., simulated tool drop) and a badly drilled hole. An initial study was conducted for each damage type to determine the detailed damage introduction parameters resulting in the selection of one set of impact and one set of poor drilling conditions. Baseline static tension and static compression tests were conducted on each of the four damage/laminate conditions. Stress vs life (S-N) fatigue data were then generated at range ratio R=-1 for each of the four conditions. The damage growth characteristics were monitored on each fatigue specimen using a modified Holscan ultrasonic unit. A subset of the damaged hole specimens was also evaluated in static compression and fatigue (R = -1) using TBE enhanced X-ray methods to monitor damage growth and to assess any detrimental effect of TBE on subsequent behavior of the damage. The results indicate significant reduction in initial static tension and compression strengths for the damaged hole condition in both laminates.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: D. E. Pettit
Publisher:
Total Pages: 0
Release: 1979
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of a three task program directed at the study of relationship between damage propagation and residual static strength of composite laminates. In Task 1: Preliminary screening, two laminates a 24-Ply 67% 0 deg. fiber and a 32-Ply quasi-isotropic laminate of T300/5208 graphite epoxy material were selected for study. Two damage types were studied, a low velocity impact condition (i.e., simulated tool drop) and a badly drilled hole. An initial study was conducted for each damage type to determine the detailed damage introduction parameters resulting in the selection of one set of impact and one set of poor drilling conditions. Baseline static tension and static compression tests were conducted on each of the four damage/laminate conditions. Stress vs life (S-N) fatigue data were then generated at range ratio R=-1 for each of the four conditions. The damage growth characteristics were monitored on each fatigue specimen using a modified Holscan ultrasonic unit. A subset of the damaged hole specimens was also evaluated in static compression and fatigue (R = -1) using TBE enhanced X-ray methods to monitor damage growth and to assess any detrimental effect of TBE on subsequent behavior of the damage. The results indicate significant reduction in initial static tension and compression strengths for the damaged hole condition in both laminates.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume III. Appendixes for Tasks II and III.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume III. Appendixes for Tasks II and III.
Author: K. N. Lauraitis
Publisher:
Total Pages: 423
Release: 1981
Genre:
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures. Volume III. Appendixes for Tasks II and III. Book in PDF, Epub and Kindle

Contents: Appendixes-Quality Control Plan; Specimen Weight Measurements; Static Test Data; Damage Growth Characteristics Under Fatigue Loading; Damage Characteristics of Specimens Tested for Residual Strength; Damage Measurements of Specimens Tested for Residual Strength; Damage as Determined by Metallographic Sectioning: Comparison of Damage as Determined by Holscan Ultrasonic C-Scan and Dib Enhanced X-Ray; Damage on Individual Layers of Specimens Deplied After Fatigue Cycling; Statistical Analysis of Panel Variability; and Discussion of Weibull Function and Parameter Estimation Procedures.

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures

Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures
Author: K. N. Lauraitis
Publisher:
Total Pages: 432
Release: 1981
Genre: Composite materials
ISBN:

Download Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures Book in PDF, Epub and Kindle

This report presents the results of the first task of the last two tasks of a three-task program focusing on the study of relationship between damage propagation and residual strength of graphite/epoxy laminates. Specimens of two laminate types, a 32-ply quasi-isotropic and 24-ply 67%-0, containing a centered poorly drilled hole were evaluated in this study. Baseline static tension and compression tests were conducted at high and low strain rates and at elevated temperature.