Behrad Koohbor
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Processing–Microstructure–Performance Relations in Thermoformed Auxetic Hyperelastic Foams with Enhanced Energy Absorption Capacity Open
Auxetic (negative Poisson's ratio) foams with reentrant cell structures exhibit enhanced mechanical properties such as superior strength, energy absorption, and fracture resistance, compared to their nonauxetic counterparts. A well-establi…
Encoding Material Safety using Control Barrier Functions for Soft Actuator Control Open
Until recently, the concept of soft robot safety was an informal notion, often attributed solely to the fact that soft robots are less likely to damage their operating environment than rigid robots. As the field moves toward feedback contr…
View article: Towards the determination of optimal 3D initiation crack shapes
Towards the determination of optimal 3D initiation crack shapes Open
An approach is proposed to determine the optimal initiation crack shapes when using the Coupled Criterion (CC) to assess 3D debonding initiation at a fiber-matrix interface. The optimal crack shapes are determined among potential crack sha…
Experimental characterization of nonlinear mechanical behavior and auxeticity in 3D-printed rotating-square auxetics with spatially variable materials Open
Additively manufactured auxetics (structures exhibiting a negative Poisson’s ratio) offer a unique combination of enhanced mechanical strength and energy absorption. These properties can be further improved through strategic material place…
View article: Comparison between 2D and 3D fiber-matrix debonding simulation for inverse identification of interface fracture properties
Comparison between 2D and 3D fiber-matrix debonding simulation for inverse identification of interface fracture properties Open
Fiber-matrix debonding in single fiber specimen is studied experimentally and numerically based on the coupled criterion for which various 2D and one 3D configurations are used. Debonding initiation and propagation are mainly due to normal…
Fiber–matrix interface debonding and transverse cracking in macro fiber composites Open
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View article: Open Review of "Comparison between 2D and 3D fiber-matrix debonding simulation for inverse identification of interface fracture properties"
Open Review of "Comparison between 2D and 3D fiber-matrix debonding simulation for inverse identification of interface fracture properties" Open
Open Review of article https://doi.org/10.46298/jtcam.12997 published in JTCAM
View article: Strain Rate Effect on the Structural Performance of Mathematically Generated Metastructures
Strain Rate Effect on the Structural Performance of Mathematically Generated Metastructures Open
Additive manufacturing approaches enable designing and fabricating structures with complex geometries, such as triply periodic minimal surface (TPMS) lattices with unique mechanics. TPMS structures are pursued for impact mitigation for civ…
Development, 3D printing, and mechanics of novel auxetic unit cell monostructures Open
[EN] Complex structures with unique mechanics are pivotal to advancing additive manufacturing, enabling applications where traditional methods are impractical. This study presents a novel 3D auxetic S-shaped monostructure designed for scal…
Subsurface Weave Pattern Influences on Polymer Cold Spray Deposits onto Woven Fiber-Reinforced Composites Open
The polymer cold spray (CS) process has recently been demonstrated as a promising coating and repair technique for fiber-reinforced polymer composites (FRPs). However, a noticeable variation in coating thickness (herein referred to as chec…
Residual Strain Development in Rapid Frontally Curing Polymers Open
Frontal polymerization (FP) has emerged as a rapid and energy-efficient process for fabricating thermoset polymers and composites. In this process, a self-propagating reaction front cures the polymer rapidly by the exothermic heat of polym…
Computational Analysis of Cold Spraying Polymer-Coated Metallic Particles on Fiber-Reinforced Polymer Substrates Open
Fiber-reinforced polymer composites are prominent structural components in various industries such as aerospace, automotive, and wind energy. These materials are considered due to their high strength-to-weight ratio and relative ease of fa…
Simultaneous Measurement of Fiber-Matrix Interface Debonding and Tunneling Using a Dual-Vision Experimental Setup Open
Background Fiber-matrix debonding is a precursor for transverse cracking and several other types of damage in fiber composites. However, to date, there are limited experiment-based reports that study the fundamental mechanisms of fiber-mat…
Additive Manufacturing and Mechanics of Mathematically-generated Meta-structures Open
Advancements in additive manufacturing coincide with the influx of assiduous research in realizing complex structures using printable composite materials with tunable properties. In this research, photocurable resins with a broad range of …
Fabrication and Characterization of Electrically Conductive 3D Printable TPU/MWCNT Filaments for Strain Sensing in Large Deformation Conditions Open
This study investigates the development of thermoplastic polyurethane (TPU) filaments incorporating multi‐walled carbon nanotubes (MWCNT) to enhance strain‐sensing capabilities. Various MWCNT reinforcement ratios are used to produce custom…
In-plane Density Gradation of Shoe Midsoles for Optimized Cushioning Performance Open
Midsoles are important components in footwear as they provide shock absorption and stability, thereby improving comfort and effectively preventing certain foot and ankle injuries. A rationally tailored midsole can potentially mitigate plan…
Full-field characterizations of additively manufactured composite cellular structures Open
Honeycomb structures possess unique mechanical and structural behaviors, including high specific strength, superior energy absorption, and potential for multifunctionality. The advantages of such structures are bolstered by their realizati…
Structural Performance of Additively Manufactured Composite Lattice Structures: Strain Rate, Cell Geometry, and Weight Ratio Effects Open
The proliferation of ordered cellular structures in industrial and technological applications is justified by their superior mechanical performance, including tunable energy absorption strategies and potential multifunctionality. This rese…
Frequency domain analyses of low-velocity impact loading of elastomeric foams Open
Frequency analyses can reveal spectral features otherwise concealed within the time domain data. Such analyses are imperative to gain more insights into the undergoing dynamics in structures and materials, especially those with strong time…