Out-of-plane compression of a novel hybrid corrugated core sandwich panel

2021 ◽  
pp. 114222
Author(s):  
Shanyouming Sun ◽  
Dan Liu ◽  
Yinglong Sheng ◽  
Shangsheng Feng ◽  
Hongbin Zhu ◽  
...  
Keyword(s):  
Sandwich Panel ◽  
Out Of Plane ◽  
Plane Compression

The Through-Thickness Compressive Strength of a Composite Sandwich Panel With a Hierarchical Square Honeycomb Sandwich Core

2009 ◽  
Vol 76 (6) ◽  
Author(s):  
F. Côté ◽  
B. P. Russell ◽  
V. S. Deshpande ◽  
N. A. Fleck
Keyword(s):  
Finite Element ◽  
Compressive Strength ◽  
Sandwich Panel ◽  
Analytical Models ◽  
Composite Sandwich ◽  
Hierarchical Topology ◽  
Collapse Mechanisms ◽  
Strength Based ◽  
Out Of Plane ◽  
Plane Compression

Sandwich panels with aluminum alloy face sheets and a hierarchical composite square honeycomb core have been manufactured and tested in out-of-plane compression. The prismatic direction of the square honeycomb is aligned with the normal of the overall sandwich panel. The cell walls of the honeycomb comprise sandwich plates made from glass fiber/epoxy composite faces and a polymethacrylimide foam core. Analytical models are presented for the compressive strength based on three possible collapse mechanisms: elastic buckling of the sandwich walls of the honeycomb, elastic wrinkling, and plastic microbuckling of the faces of the honeycomb. Finite element calculations confirm the validity of the analytical expressions for the perfect structure, but in order for the finite element simulations to achieve close agreement with the measured strengths it is necessary to include geometric imperfections in the simulations. Comparison of the compressive strength of the hierarchical honeycombs with that of monolithic composite cores shows a substantial increase in performance by using the hierarchical topology.

Out-of-plane static compression and energy absorption of paper hierarchical corrugation sandwich panels

2021 ◽  
pp. 030932472110085
Author(s):  
Huineng Wang ◽  
Yanfeng Guo ◽  
Yungang Fu ◽  
Dan Li
Keyword(s):  
Yield Strength ◽  
Bearing Capacity ◽  
Energy Absorption ◽  
Sandwich Panel ◽  
Second Order ◽  
Compression Rate ◽  
Static Compression ◽  
First Order ◽  
Out Of Plane ◽  
Analytical Approaches

This study introduces the opinion of the corrugation hierarchy to develop the second-order corrugation paperboard, and explore the deformation characteristics, yield strength, and energy absorbing capacity under out-of-plane static evenly compression loading by experimental and analytical approaches. On the basis of the inclined-straight strut elements of corrugation unit and plastic hinge lines, the yield and crushing strengths of corrugation unit were analyzed. This study shows that as the compressive stress increases, the second-order corrugation core layer is firstly crushed, and the first-order corrugation structures gradually compacted until the failure of entire structure. The corrugation type has an obvious influence on the yield strength of the corrugation sandwich panel, and the yield strength of B-flute corrugation sandwich panel is wholly higher than that of the C-flute structure. At the same compression rate, the flute type has a significant impact on energy absorption, and the C-flute second-order corrugation sandwich panel has better bearing capacity than the B-flute structure. The second-order corrugation sandwich panel has a better bearing capacity than the first-order structure. The static compression rate has little effect on the yield strength and deformation mode. However, with the increase of the static compression rate, the corrugation sandwich panel has a better cushioning energy absorption and material utilization rate.

Out of plane performance of novel concrete sandwich panel using different geosynthetics

2021 ◽  
Vol 300 ◽  
pp. 124186
Author(s):  
Upender Bishnoi ◽  
A.B. Danie Roy ◽  
Naveen Kwatra
Keyword(s):  
Sandwich Panel ◽  
Out Of Plane

scholarly journals The Out-of-Plane Compression Behavior of Cross-Ply AS4/PEEK Thermoplastic Composite Laminates at High Strain Rates

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2312 ◽  
Author(s):  
Huiran Zou ◽  
Weilong Yin ◽  
Chaocan Cai ◽  
Bing Wang ◽  
Ankang Liu ◽  
...  
Keyword(s):  
Composite Laminates ◽  
High Strain ◽  
Damage Mechanism ◽  
Strain Rates ◽  
Failure Condition ◽  
High Strain Rates ◽  
Peek Composite ◽  
Out Of Plane ◽  
Complete Failure ◽  
Plane Compression

The dynamic mechanical behavior of thermoplastic composites over a wide range of strain rates has become an important research topic for extreme environmental survivability in the fields of military protection, aircraft safety, and aerospace engineering. However, the dynamic compression response in the out-of-plane direction, which is one of the most important loading conditions resulting in the damage of composite materials, has not been investigated thoroughly when compared to in-plane compression and tensile behavior under high strain rates. Thus, we used split Hopkinson pressure bar (SHPB) tests to conduct the out-of-plane compression test of cross-ply carbon fiber-reinforced polyetheretherketone (AS4/PEEK) composite laminates. Afterward, the damage mechanism under different strain rates was characterized by the macrostructure morphologies and scanning electron microscope micrographs. Two major cases of the incomplete failure condition and complete failure condition were discussed. Dynamic stress-strain curves expound the strain rates dependencies of elastic modulus, failure strength, and failure strain. An obvious spring-back process could be observed under incomplete failure tests. For the complete failure tests, secondary loading could be observed by reconstructing and comparing the dynamic response history. Lastly, various failure modes that occurred in different loading strain rates illustrate that the damage mechanism also shows obvious strain rate sensitivity.

scholarly journals Mechanical bistability enabled by ectodermal compression facilitates Drosophila mesoderm invagination

2021 ◽  
Author(s):  
Hanqing Guo ◽  
Michael Swan ◽  
Shicheng Huang ◽  
Bing He
Keyword(s):  
Myosin Ii ◽  
Cell Sheet ◽  
Apical Surface ◽  
Apical Constriction ◽  
Out Of Plane ◽  
A Cell ◽  
Plane Compression ◽  
Contractile Forces ◽  
Tissue Relaxation ◽  
Muscle Myosin

Apical constriction driven by non-muscle myosin II (″myosin″) provides a well-conserved mechanism to mediate epithelial folding. It remains unclear how contractile forces near the apical surface of a cell sheet drive out-of-plane bending of the sheet and whether myosin contractility is required throughout folding. By optogenetic-mediated acute inhibition of myosin, we find that during Drosophila mesoderm invagination, myosin contractility is critical to prevent tissue relaxation during the early, ″priming″ stage of folding but is dispensable for the actual folding step after the tissue passes through a stereotyped transitional configuration, suggesting that the mesoderm is mechanically bistable during gastrulation. Combining computer modeling and experimental measurements, we show that the observed mechanical bistability arises from an in-plane compression from the surrounding ectoderm, which promotes mesoderm invagination by facilitating a buckling transition. Our results indicate that Drosophila mesoderm invagination requires a joint action of local apical constriction and global in-plane compression to trigger epithelial buckling.

Mechanical behaviors of C/SiC pyramidal lattice core sandwich panel under in-plane compression

2019 ◽  
Vol 214 ◽  
pp. 103-113 ◽  
Author(s):  
Yanfei Chen ◽  
Lu Zhang ◽  
Yunong Zhao ◽  
Rujie He ◽  
Shigang Ai ◽  
...  
Keyword(s):  
Sandwich Panel ◽  
Mechanical Behaviors ◽  
Plane Compression ◽  
Lattice Core

Effects of adhesive parameters on out-of-plane compression and compression fatigue response of adhesively bonded sandwiches with pyramidal core

2018 ◽  
Vol 206 ◽  
pp. 131-139 ◽  
Author(s):  
Zhi-jia Zhang ◽  
Qian-cheng Zhang ◽  
Xiao-bo Shi ◽  
Wei-jin Zhang ◽  
Feng Jin
Keyword(s):  
Adhesively Bonded ◽  
Out Of Plane ◽  
Plane Compression
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