Summary of Marine and Hydrokinetic (MHK) Composites Testing at Montana State University

Miller, David A.; Samborsky, Daniel D.; Stoffels, Mark T.; Voth, Michael D; Nunemaker, Jake; Newhouse, Kai; Hernandez-Sanchez, Bernadette A.

doi:10.2172/1668132

Cited by 3 publications

(4 citation statements)

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“…Figure 8 shows comparisons of tensile strains measured on the T-bolt FRP laminates to the side of the barrel nuts when compared with σ B . Generally, it appears that the environmental aging process had little effect on the stiffness of the specimens, as is consistent with previous research [23]. Degradation in water primarily influences the polymer matrix and fiber/matrix interface, so does not typically influence stiffness in fiber-dominant laminates, like the T-bolt specimens in this study.…”

Section: Static Strength Characterizationsupporting

confidence: 90%

“…Large FRP panels were manufactured at MSU by vacuum-assisted resin infusion lowing ASTM D5687-95 Standard Guide for Preparation of Flat Composite Panels Processing Guidelines for Specimen Preparation [22]. Heavy-weight quadraxial E-g fabric (Vectorply E-QX 9000, Phenix City, AL, USA) for the fiber reinforcement and different resin systems were investigated for matrix materials: a Hexion Epikote M RIMR 035c two-part epoxy system (Hexion, Columbus, OH, USA) and a Derakane 4 350 vinylester-epoxy (VE) system (Ashland Performance Materials, Columbus, OH, U Both resin systems are advertised as having good corrosion resistance and have been h lighted as good candidates for the manufacturing of marine energy structures [23]. resulting glass-reinforced epoxy and VE panels were approximately 43 mm thick.…”

Section: Specimen Design Materials and Manufacturingmentioning

confidence: 99%

“…For specimens with fatigue lives shorter than 10 5 cycles, this is unlikely to have significantly influenced the results, but may have had an effect on the longer-duration fatigue tests. Past research has shown that some strength properties of hygrothermally aged FRPs can be recovered by drying the laminates [23]. There is a possibility that specimen fatigue lives for the longer duration tests may have been extended by this phenomenon.…”

Section: Fatigue Strength Characterizationmentioning

confidence: 99%

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Static and Fatigue Characterization of Large Composite T-Bolt Connections in Marine Hygrothermal Environments

Murdy,

Hughes,

Miller

et al. 2023

JMSE

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Fiber-reinforced polymer composites have been highlighted as ideal candidates for structural applications in marine renewable energy devices, such as tidal turbines and wave energy converters. It is well understood that harsh marine environments can cause strength degradation of composite laminates, which has been extensively researched at the coupon scale; however, no research has investigated how this translates into larger-scale composite structures. This paper presents a subcomponent-scale study which investigates the effects of hygrothermal aging and subsequent static and fatigue characterization of thick composite T-bolt connections as part of a large, multilaboratory materials research effort. Of the glass-reinforced epoxy and vinylester-epoxy matrix composites tested, both showed measurable static strength degradation (4–36%) after being hygrothermally aged, even though the composite specimens were only partially saturated with water. Under tension–tension fatigue loading, the epoxy specimens performed very well in their dry states but exhibited significant degradation after hygrothermal aging. In comparison, the vinylester-epoxy specimens had much shorter fatigue lives in their dry states but exhibited no degradation after hygrothermal aging. Overall, this research demonstrates that hygrothermal aging can have significant effects on the ultimate strengths and fatigue lives of even partially saturated thick composite T-bolt connections, indicating that degradation of the outer plies on thick composite laminates can have pronounced effects on the whole structure. It discusses the challenges of building an understanding of the effects of harsh marine environments in large-scale composite structures.

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Section: Static Strength Characterizationsupporting

confidence: 90%

Section: Specimen Design Materials and Manufacturingmentioning

confidence: 99%

Section: Fatigue Strength Characterizationmentioning

confidence: 99%

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Static and Fatigue Characterization of Large Composite T-Bolt Connections in Marine Hygrothermal Environments

Murdy,

Hughes,

Miller

et al. 2023

JMSE

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“…To approach these goals, a large testing program was developed at NREL to investigate a variety of materials and design details at the subcomponent scale (Murdy and Hughes 2020) that were highlighted by industry surveys and previous coupon-scale characterization data (Miller et al 2020). A variety of specimen geometries were designed to highlight key features of multimaterial (composite/composite or metal/composite) interconnects that may be utilized in marine energy structural designs.…”

Section: Introductionmentioning

confidence: 99%

Subcomponent Validation of Composite Joints for the Marine Energy Advanced Materials Project

Murdy

Hughes

Miller

et al. 2023

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A Multicontinuum-Theory-Based Approach to the Analysis of Fiber-Reinforced Polymer Composites with Degraded Stiffness and Strength Properties Due to Moisture Absorption

Anderson

Gunawan

Nicholas

et al. 2023

JMSE

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Marine energy generation technologies such as wave and tidal power have great potential in meeting the need for renewable energy in the years ahead. Yet, many challenges remain associated with marine-based systems because of the corrosive environment. Conventional materials like metals are subject to rapid corrosive breakdown, crippling the lifespan of structures in such environments. Fiber-reinforced polymer composites offer an appealing alternative in their strength and corrosion resistance, but can experience degradation of mechanical properties as a result of moisture absorption. An investigation is conducted to test the application of a technique for micromechanical analysis of composites, known as multicontinuum theory and demonstrated in past works, as a mechanism for predicting the effects of prolonged moisture absorption on the performance of fiber-reinforced composites. Experimental tensile tests are performed on composite coupons with and without prolonged exposure to a salt water solution to obtain stiffness and strength properties. Multicontinuum theory is applied in conjunction with micromechanical modeling to deduce the effects of moisture absorption on the behavior of constituent materials within the composites. The results are consistent with experimental observations when guided by known mechanisms and trends from previous studies, indicating multicontinuum theory as a potentially effective tool in predicting the long-term performance of composites in marine environments.

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Summary of Marine and Hydrokinetic (MHK) Composites Testing at Montana State University

Cited by 3 publications

References 0 publications

Static and Fatigue Characterization of Large Composite T-Bolt Connections in Marine Hygrothermal Environments

Static and Fatigue Characterization of Large Composite T-Bolt Connections in Marine Hygrothermal Environments

Subcomponent Validation of Composite Joints for the Marine Energy Advanced Materials Project

A Multicontinuum-Theory-Based Approach to the Analysis of Fiber-Reinforced Polymer Composites with Degraded Stiffness and Strength Properties Due to Moisture Absorption

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