Randomly reinforced composites: properties, failure and aspects of material design

Ioniţă, Axinte; Weitsman, Y.

doi:10.1016/j.probengmech.2005.07.006

Cited by 12 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The composite volume fraction V f was determined using the density values of 1.82 g/cm 3 and 1.14 g/cm 3 for the TR50S and PA6 resins, respectively, and the following formula…”

Section: Materials Fabrication and Testing Setupmentioning

confidence: 99%

“…Discontinuous fiber-reinforced composites, such as sheet molding compounds (SMCs) and mats fabricated from randomly distributed glass fibers, carbon fiber (CF) tows or their strands, have been used for producing complex shapes, and various parameters that affect their mechanical properties have been discussed in the literature. [2][3][4][5][6] Owing to the increased interest in the discontinuous fiber-reinforced composites for airplane parts, thermoset composites composed of randomly distributed chopped prepreg tapes have been recently developed (see the related commercial brands such as Hexcel HexMC Õ and Quantum Lytex Õ 4149). The tensile modulus of these materials is similar to that of quasi-isotropic (Q-iso) laminates with the same fiber volume fractions (V f ), although their tensile strength values are generally lower (often by more than a factor of two).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental characterization of the tensile failure mode of ultra-thin chopped carbon fiber tape-reinforced thermoplastics

Yamashita

Hashimoto

Suganuma

et al. 2016

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Ultra-thin chopped carbon fiber tape-reinforced thermoplastics, which belong to a class of randomly oriented strands and are characterized by enhanced strength, stiffness, and formability properties, have been prepared via a paper-making method from ultra-thin thermoplastic prepregs. The failure of ultra-thin chopped carbon fiber tape-reinforced thermoplastics under static tensile loading was studied in detail using various observation techniques, such as high-speed camera imaging, thermography, and optical microscopy. The obtained results revealed that the tensile fracture of ultra-thin chopped carbon fiber tape-reinforced thermoplastics exhibited three main patterns: fiber breakage, splitting of chopped tapes, and pulling out of chopped tapes. In contrast to conventional randomly oriented strands, the utilization of ultrathin prepregs decreased the tensile strength scattering. An increase in the ultra-thin prepreg tape length resulted in an increase in the strength average magnitude, reaching saturation at a length of 18 mm. The results of this study can be used for constructing tensile strength prediction models and expanding the ultra-thin chopped carbon fiber tape-reinforced thermoplastics application range.

show abstract

“…The composite volume fraction V f was determined using the density values of 1.82 g/cm 3 and 1.14 g/cm 3 for the TR50S and PA6 resins, respectively, and the following formula…”

Section: Materials Fabrication and Testing Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental characterization of the tensile failure mode of ultra-thin chopped carbon fiber tape-reinforced thermoplastics

Yamashita

Hashimoto

Suganuma

et al. 2016

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

show abstract

“…As noted there are only a few discussions on the microstructure evaluation of fibre mat composites. Nonetheless, Ionita and Weitsman [7] used the laminate theory to investigate the aspects of the mechanical behaviour of a random array of chopped carbon-fiber strands embedded in a urethane resin and accounted for the random distributions of various strands and scatter in their mechanical properties been dependent on the sample size. To account for undulations of chopped strands at their crossover points, 82.5% of the reduced stiffness element Q 11 of the unidirectionally reinforced ply equivalent was used for computations.…”

Section: Literaturementioning

confidence: 99%

Hybrid-modelling of Mechanical Properties and Thermo-mechanical Behaviour of Chopped Strand Mat Reinforced Thermoset Composites

Agbo

2020

JERR

View full text Add to dashboard Cite

The concern of this paper is to develop simple workshop application models for predicting the mechanical properties and the evaluation of the thermo-mechanical behaviour of chopped strand fibre-mat reinforced thermoset composites. A hybrid of empirical and strength of materials approach was used at macro- and micro-mechanics levels to model the random fibres which were treated as simple bars within the mat preform and the resulting composite material. The model was validated experimentally by testing wet lay-up produced samples with varying fibre volume fractions and they were found to agree well. The toughness modulus of the composite was also modeled using the secant modulus obtained from the sample’s stress – strain curves of uniform material composites produced at different temperature histories. The toughness modulus determined using the new model was compared with that obtained using the area under the same stress – strain curve computed by Simpson’s rule and the results agreed very well.

show abstract

“…Examples of microstructure simulation based on this approach are (Austin et al, 2006;Clements et al, 2006;Ionita and Weitsman, 2006;Mas et al, 2006;Reusch et al, 2008).…”

Section: Rsve Of Idealized Particle Systemmentioning

confidence: 99%

A hierarchical framework for the multiscale modeling of microstructure evolution in heterogeneous materials.

Luscher¹

2010

View full text Add to dashboard Cite

ACKNOWLEDGEMENTSAs far as I am concerned, there is no better way to celebrate a success than to share the credit with those that have contributed to the effort. Here I share credit with those people that have had tremendous impact to the successful completion of requirements for my PhD degree at Georgia Tech, including this dissertation.Of primary importance in this acknowledgement is to convey how substantial I consider my wife's sacrifices over the last five years. With the sole exception of unmarried PhD candidates, Ido not imagine that there exists a PhD thesis whose acknowledgement section does not make reference to the author's spouse. So I strive to make this acknowledgement of my wife's contributions to my success so compelling and unique that it escapes the status of 'formality'. To attempt this, I will provide a single anecdote selected from five years of worthy material.Stephanie Luscher endured months alone keeping our house in Los Alamos while I was in Atlanta attending classes and fulfilling residency requirements. During that time, she continued working as an engineering design review coordinator at Los Alamos National Lab. While in Oregon to visit family during the winter of 2004-5, a water pipe inside our Los Alamos house froze and burst. Over the next week, 90,000 gallons of water flowed throughout our house ruining just about everything. We returned home and opened soggy Christmas presents from the relative comfort of our car parked in the driveway while contemplating our next course of action.Our house required extensive repairs including a new heating system, kitchen cabinets, flooring, and complete refinishing of the interior walls. We lived in a motor home, a rented house, and a hotel over the course of six months of these repairs. Within two weeks of this happening, I was back in Atlanta and Stephanie was left to manage the reconstruction effort by herself. Of course, this is a single example of how Stephanie has sacrificed, and tended to the many details of life, in order to allow me to focus attention on the work presented within this thesis. Stephanie, I thank iv you for the support and sacrifice you have made to help me accomplish this goal. I'm glad you embraced "my goal" as "our goal."Well in advance of thoughts regarding graduate school, my parents instilled a few helpful traits in me. As a young boy, during hot summers spent roofing with my Dad, Mark Luscher, I learned to work hard and to play hard. My Dad taught me that sometimes "getting the job done" is not elegant; it simply requires you to roll up your sleeves and get to work. As a complement to this, my Mom taught me the importance of precision and attention to detail. Together, my parents have taught me the importance of family, which supersedes all else. Engineering division leader (W-DO), gave me opportunities to excel within the weapons program. Ryan Maupin, group leader for Advanced Engineering Analysis (W-13) has enthusiastically supported and trusted me, both as my manager and friend, to pursue a course of research th...

show abstract

Randomly reinforced composites: properties, failure and aspects of material design

Cited by 12 publications

References 8 publications

Experimental characterization of the tensile failure mode of ultra-thin chopped carbon fiber tape-reinforced thermoplastics

Experimental characterization of the tensile failure mode of ultra-thin chopped carbon fiber tape-reinforced thermoplastics

Hybrid-modelling of Mechanical Properties and Thermo-mechanical Behaviour of Chopped Strand Mat Reinforced Thermoset Composites

A hierarchical framework for the multiscale modeling of microstructure evolution in heterogeneous materials.

Contact Info

Product

Resources

About