subject:(ASTM D6641)

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1. Hedgepeth, Ryan Keith. A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments.

Degree: M.S. in Engineering Science, Mechanical Engineering, 2016, University of Mississippi

URL: https://egrove.olemiss.edu/etd/1069

A collaborative study was conducted to examine the degradation of commercially pultruded uni-directional e-glass composites. The case study specimens, including a variety of commercially pultruded polyester/e-glass and vinylester/e-glass composites were exposed to corrosive environments, namely: distilled water (h2o), bleach (naclo), and hydrochloric acid (hcl) for a minimum of 60 days, and the degradation was analyzed. Such a study was chosen on two accounts, 1) to contribute viable data to industry and research and 2) to provide data to be used to develop a standardized practice to characterize the durability for pultruded composites used for structural applications. A control group was tested without any exposure at room temperature using ASTM D6641-09 and ASTM D2344-13 for compressive properties (strength and modulus) and short-beam strength, respectively. Values obtained were then compared to their respective exposed values. Statistical analysis including coefficient of variation (COV), retention rates, and average percent weight change were calculated from the data obtained to determine what effect each corrosive environment had on the specimens and which, if any test method provided the most repeatable results. It was ultimately determined that short-beam strength data yielded the lowest COV values and thus provided the most consistent uniform data, CLC strength gave the first glance at deterioration yielding retention rates 5-10% lower than short-beam strength, and in many instances, an inverse relationship between average percentage weight change and retention rates was found. Advisors/Committee Members: Ellen Lackey, Amrita Mishra, Tejas Pandya.

Subjects/Keywords: Astm D2344; Astm D6641; Corrosion; Degradation; Mechanical Testing; Pultruded Composites; Mechanical Engineering

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APA (6^th Edition):

Hedgepeth, R. K. (2016). A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments. (Thesis). University of Mississippi. Retrieved from https://egrove.olemiss.edu/etd/1069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hedgepeth, Ryan Keith. “A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments.” 2016. Thesis, University of Mississippi. Accessed March 04, 2021. https://egrove.olemiss.edu/etd/1069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hedgepeth, Ryan Keith. “A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments.” 2016. Web. 04 Mar 2021.

Vancouver:

Hedgepeth RK. A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments. [Internet] [Thesis]. University of Mississippi; 2016. [cited 2021 Mar 04]. Available from: https://egrove.olemiss.edu/etd/1069.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hedgepeth RK. A Study Of The Mechanical Behavior Of Composite Materials Exposed To Corrosive Environments. [Thesis]. University of Mississippi; 2016. Available from: https://egrove.olemiss.edu/etd/1069

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

2. Glath, Michael Charles. Compression behavior of ultra-high modulus carbon/epoxy composites and fracture energy characterization of intermediate modulus carbon/epoxy composites.

Degree: 2014, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/21953

Among compression test methods, ASTM D3410, SACMA SRM 1R-94, and ASTM D6641 are currently used to determine the compression modulus and compression strengths for ultra-high modulus (UHM, >350 GPa) composites. In this study, the compression modulus and compression strength of a proprietary ultra-high modulus carbon/epoxy composite were experimentally determined using SACMA SRM 1R-94 and ASTM D6641 for laminates with stacking sequences of [(0/±60)S]2 and [(+60/0/-60)S]2. The moduli of both laminates were experimentally shown to be statistically equivalent; the strength of the [(0/±60)S]2 laminate was shown to be significantly less than the [(+60/0/-60)S]2 laminate. A non-linear finite element model, using the commercial software package Abaqus, was developed for each compression test to predict the compression modulus and compression strength using the built-in damage progression algorithm in Abaqus. The models were used to identify failure modes for each compression test. Premature end-crushing was predicted at 2,200 µε in the modeled modulus specimen of SACMA SRM 1R-94 for the [(+60/0/-60)S]2 laminate. End-crushing in the modeled SACMA SRM 1R-94 strength specimen was predicted to occur slightly after ultimate laminate failure for the [(+60/0/-60)S]2 laminate. End-crushing was predicted to be highly unlikely for both laminates in the ASTM D6641 model. The stress-strain response of both models matched relatively well with experimental data. The predicted strengths for both test methods were underpredicted for the [(+60/0/-60)S]2 laminate and overpredicted for the [(0/±60)S]2 laminate. The fracture toughness of a proprietary intermediate modulus carbon/epoxy [0]10 laminate was experimentally determined using ASTM D5528 and a U.S. Government provided end-notched flexure compliance calibration test method for modes I and II, respectively. Significant fiber bridging was noted for the ASTM D5528 experimental test specimens, especially at the crack tips. A finite element model was developed for each test method using the virtual crack closure technique. A boundary was developed for the modeled load-displacement plot to encompass the experimental behavior of test specimens. This predicted boundary agreed well with mode I of ASTM D5528 experimental data. The predicted load-displacement response of mode II had a stiffer response than the experimental data, but the model did not consider potential stiffness degradation due to 5 preload calibrations used on each test specimen. A statistical sensitivity analysis (ANOVA), based on the previously developed finite element model of ASTM D6641, was used to vary parameters assumed to influence the compression modulus, compression strength, and first ply failure of ASTM D6641. Of the chosen parameters, fiber misalignment was predicted to significantly affect the FEA-based results of the compression modulus, compression strength, and first ply failure for the chosen levels of variation. The laminate thickness, adhesive thickness, and enforced bolt displacement were… Advisors/Committee Members: Kevin L Koudela, Thesis Advisor/Co-Advisor, Charles E Bakis, Thesis Advisor/Co-Advisor.

Subjects/Keywords: ASTM D6641; SACMA SRM 1R-94; ASTM D5528; end-notched flexure; ANOVA; finite element analysis; damage; fracture energy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Glath, M. C. (2014). Compression behavior of ultra-high modulus carbon/epoxy composites and fracture energy characterization of intermediate modulus carbon/epoxy composites. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/21953

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Glath, Michael Charles. “Compression behavior of ultra-high modulus carbon/epoxy composites and fracture energy characterization of intermediate modulus carbon/epoxy composites.” 2014. Thesis, Penn State University. Accessed March 04, 2021. https://submit-etda.libraries.psu.edu/catalog/21953.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vancouver:

Glath MC. Compression behavior of ultra-high modulus carbon/epoxy composites and fracture energy characterization of intermediate modulus carbon/epoxy composites. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 04]. Available from: https://submit-etda.libraries.psu.edu/catalog/21953.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Glath MC. Compression behavior of ultra-high modulus carbon/epoxy composites and fracture energy characterization of intermediate modulus carbon/epoxy composites. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/21953

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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