scholarly journals Revealing the Dynamic Characteristics of Composite Material-Based Miura-Origami Tube

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6374
Author(s):  
Houyao Zhu ◽  
Zhixin Li ◽  
Ruikun Wang ◽  
Shouyan Chen ◽  
Chunliang Zhang ◽  
...  
Keyword(s):  
Composite Structures ◽  
Mechanical Performance ◽  
Resin Composite ◽  
Dynamic Displacement ◽  
Displacement Response ◽  
Epoxy Resin Composite ◽  
Out Of Plane ◽  
Nature Frequency ◽  
New Ideas ◽  
Dynamic Performances

Although Miura origami has excellent planar expansion characteristics and good mechanical properties, its congenital flaws, e.g., open sections leading to weak out-of-plane stiffness and constituting the homogenization of the material, and resulting in limited design freedom, should also be taken seriously. Herein, two identical Miura sheets, made of carbon fiber/epoxy resin composite, were bonded to form a tubular structure with closed sections, i.e., an origami tube. Subsequently, the dynamic performances, including the nature frequency and the dynamic displacement response, of the designed origami tubes were extensively investigated through numerical simulations. The outcomes revealed that the natural frequency and corresponding dynamic displacement response of the structure can be adjusted in a larger range by varying the geometric and material parameters, which is realized by combining origami techniques and the composite structures’ characteristics. This work can provide new ideas for the design of light-weight and high-mechanical-performance structures.

Preparation and Characterization of Epoxy Resin Composite Modified by Flexible Polyurethane Resin

2014 ◽  
Vol 904 ◽  
pp. 170-172 ◽  
Author(s):  
Rong Cheng ◽  
Cheng Zhang ◽  
Jing Wang
Keyword(s):  
Composite Materials ◽  
Epoxy Resin ◽  
Performance Test ◽  
Mechanical Performance ◽  
Resin Composite ◽  
Mass Ratio ◽  
Scanning Calorimetry ◽  
Epoxy Resin Composite ◽  
Amine Curing ◽  
Modified Epoxy

In this paper, under the effect of MD1041 cashew oil modified phenolic amine curing agent for epoxy resin, it successfully prepared polyurethane flexible resin modified epoxy resin composite materials by using polyurethane modified epoxy resin reinforced flexible resin. Modified composite material of the new preparation is characteristed by the method of the mechanical performance test, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC). The results show that the flexible resin has a strong effect on the toughness of modified epoxy resin composite materials. When the mass ratio of the flexible resin account for 5.9%,comprehensive mechanical properties of the modified composites is at the premium; when the mass ratio of flexible resin account for 3.1%, the thermal stability of the epoxy resin modified with flexible resin is at the best.

scholarly journals Thermal and Reliability Characterization of an Epoxy Resin-Based Double-Side Cooled Power Module

2021 ◽  
Vol 18 (3) ◽  
pp. 123-136
Author(s):  
Tzu-Hsuan Cheng ◽  
Kenji Nishiguchi ◽  
Yoshi Fukawa ◽  
B. Jayant Baliga ◽  
Subhashish Bhattacharya ◽  
...  
Keyword(s):  
Epoxy Resin ◽  
High Power ◽  
High Performance ◽  
Mechanical Performance ◽  
Resin Composite ◽  
Wide Band ◽  
Cost Effective ◽  
Power Module ◽  
Wide Band Gap ◽  
Epoxy Resin Composite

Abstract Wide-Band Gap (WBG) power devices have become a promising option for high-power applications due to the superior material properties over traditional Silicon. To not limit WBG devices’ mother nature, a rugged and high-performance power device packaging solution is necessary. This study proposes a Double-Side Cooled (DSC) 1.2 kV half-bridge power module having dual epoxy resin insulated metal substrate (eIMS) for solving convectional power module challenges and providing a cost-effective solution. The thermal performance outperforms traditional Alumina (Al2O3) Direct Bonded Copper (DBC) DSC power module due to moderate thermal conductivity (10 W/mK) and thin (120 mm) epoxy resin composite dielectric working as the IMS insulation layer. This novel organic dielectric can withstand high voltage (5 kVAC @ 120 μm) and has a Glass Transition Temperature (Tg) of 300°C, which is suitable for high-power applications. In the thermal-mechanical modeling, the organic DSC power module can pass the thermal cycling test over 1,000 cycles by optimizing the mechanical properties of the encapsulant material. In conclusion, this article not only proposes a competitive organic-based power module but also a methodology of evaluation for thermal and mechanical performance.

scholarly journals Use of microfasteners to produce damage tolerant composite structures

2016 ◽  
Vol 374 (2071) ◽  
pp. 20150277 ◽  
Author(s):  
Ivana K. Partridge ◽  
Stephen R. Hallett
Keyword(s):  
Composite Structures ◽  
Structural Integrity ◽  
Mechanical Response ◽  
Mechanical Performance ◽  
Crack Opening ◽  
Complex Loading ◽  
Mechanical Tests ◽  
Crack Bridging ◽  
Delamination Crack ◽  
Out Of Plane

The paper concerns the mechanical performance of continuous fibre/thermosetting polymer matrix composites reinforced in the through-thickness direction with fibrous or metallic rods or threads in order to mitigate against low delamination resistance. Specific illustrations of the effects of microfasteners in reducing delamination crack growth are made for Z-pinned and tufted composites. Response to loading in such ‘structured materials’ is subject to multiple parameters defining their in-plane and out-of-plane properties. Single microfastener mechanical tests are well suited to establish the crack bridging laws under a range of loading modes, from simple delamination crack opening to shear, and provide the basis for predicting the corresponding response of microfastener arrays, within a given material environment. The fundamental experiments on microfasteners can be used to derive analytical expressions to describe the crack bridging behaviour in a general sense, to cover all possible loadings. These expressions can be built into cohesive element constitutive laws in a finite-element framework for modelling the effects of microfastener arrays on the out-of-plane mechanical response of reinforced structural elements, including the effects of known manufacturing imperfections. Such predictive behaviour can then be used to assess structural integrity under complex loading, as part of the component design process. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

Analysis of High Velocity Impact on Composite Structures

2014 ◽  
Vol 617 ◽  
pp. 104-109 ◽  
Author(s):  
Milan Žmindák ◽  
Zoran Pelagić ◽  
Maroš Bvoc
Keyword(s):  
Carbon Fibers ◽  
Composite Structures ◽  
Impact Resistance ◽  
Leading Edge ◽  
Layered Composite ◽  
Bird Strike ◽  
Out Of Plane ◽  
The Matrix ◽  
Composite Wing ◽  
Considerable Damage

In the recent years a big focus is subjected to the response of structures subjected to out-of-plane loading such as blasts, impact, etc. not only to homogenous materials, but also to heterogeneous materials, such as composites. Such form of loading can cause considerable damage to the structure. In the case of layered composite materials the damage can have several forms, starting from damage in layers up to delamination and full damage of the construction. This paper describes the investigation of shockwave propagation in composite structures caused by impact loading. The composite consists of carbon fibers in a polymer matrix, in which the fibers are much stiffer then the matrix. Finite element simulations were carried out for a “bird” strike impact on a composite wing leading edge. Results show a good impact resistance and good damping abilities of shockwaves.

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