Fracture mechanical model for tensile strength of particle reinforced elastomeric composites

Kumar

Polymers for Advanced Techs

2019

Self Cite

Magnetorheological elastomer (MRE) specimens were prepared to find the optimum compressive characteristics using different types and amounts of iron powder. A magnetic field of up to 2 T was applied during vulcanization. Among the four types of iron powders, the specimen with round‐shaped carbonyl iron powder and small grain size shows higher magnetic effects than that with bigger and irregularly shaped electrolyte iron powder. However, the compressive modulus of the rubber with electrolyte iron powder is higher without magnetic treatment at a given amount. In general, the bigger and irregularly shaped iron particles tend to move slowly and produce nonuniform distribution when a magnetic field is applied. The experimental results show that the mechanical properties are better when applying a magnetic field of 1.5 T compared with 2.0 T during the specimen vulcanization. Applying a magnetic field of 300 mT during the compression test enhanced the compressive modulus by 12% to 15%. The rate of increase of the modulus decreased exponentially with prestrain.

“…As the particle content increases, the strength also increases. These results are quite well agreed with the previous studies and can be studied for nonuniform distribution.…”

Section: Resultssupporting

confidence: 93%

Compressive properties of magnetorheological elastomer with different magnetic fields and types of filler

Kumar

Polymers for Advanced Techs

2019

Self Cite

“…As observed, the experimental results follow a trend similar to the predicted tensile stress whereby the smaller particle size holds the highest tensile stress, and a higher percentage rigidity of particles yields higher tensile stress. A study by Lee (2016) involving the tensile strength of particle-reinforced elastomeric composites confirmed this phenomena in an observed similar behavior in that increasing particle size yields lower mechanical properties. The researcher also postulated that the interfacial bond between the particle and matrix has a significant effect on the composite tensile strength, especially for smaller sized particles.…”

Section: Effect Of Changes In Particle Size and Percentage Rigidity O...mentioning

confidence: 60%

Prediction and validation of composite mechanical properties resulting from voxel-based microstructural design in material jetting

Kaweesa

Bobbio

Beese

et al. 2022

RPJ

Purpose This study aims to investigate the tensile strength and elastic modulus of custom-designed polymer composites developed using voxel-based design. This study also evaluates theoretical models, such as the rule of mixtures, Halpin–Tsai model, Cox–Krenchel model and the Young–Beaumont model and the ability to predict the mechanical properties of particle-reinforced composites based on changes in the design of rigid particles at the microscale within a flexible polymer matrix. Design/methodology/approach This study leverages the PolyJet process for voxel-printing capabilities and a design of experiments approach to define the microstructural design elements (i.e. aspect ratio, orientation, size and volume fraction) used to create custom-designed composites. Findings The comparison between the predictions and experimental results helps identify appropriate methods for determining the mechanical properties of custom-designed composites ensuring informed design decisions for improved mechanical properties. Originality/value This work centers on multimaterial additive manufacturing leveraging design freedom and material complexity to create a wide range of composite materials. This study highlights the importance of identifying the process, structure and property relationships in material design.

“…First, assuming that a specimen is fixed in the lower load cell of the tensile tester, we applied a fixed support to the bottom end of the specimen. Also assuming that the specimens were being applied by the upper load cell, we performed the experiment by applying force-displacement of 5mm/min to the top end of the specimen [13][14]. Figure 3 shows in a graph the resulting load values as affected by displacement, which occurred when we performed the simulation analysis on the CFRP-stainless steel core sandwich-style notched tensile specimen model.…”

Section: Boundary Conditionsmentioning

confidence: 99%

A study on the sandwich-style notched tensile specimens for different materials through a simulation analysis

Lee¹,

Cho²

2018

IJET

Background/Objectives: This study designed a model that used the sandwich-style notched tensile specimens of the same specifications by applying to the properties of CFRP, stainless steel, and aluminum, and performed a test simulation.Methods/Statistical analysis: The study used CATIA design software to perform the 3D modeling of the sandwich-style notched tensile specimens with the properties of CFRP, a composite material, and stainless steel and aluminum, both ordinary metals, and then, performed a tensile test simulation.Findings: By designing the sandwich-style notched tensile specimens of the same specifications and performing a test simulation, we were able to verify the tensile strength and durability of the specimens for the different materials. This study result showed that unlike the specimens for the ordinary metals, those specimens with the properties of the composite material of CFRP first showed maximum load instead of breaking immediately due to the fibers in CFRP, before they resisted displacement in response to the alternately increasing and decreasing load until it fractured. To be specific, we saw that the CFRP specimens had the more excellent tensile strength and durability.Improvements/Applications: The data obtained from the studies will serve as the basic data for studies on the composite materials like CFRP and other various materials.