Compressive effect of jute fiber corrugated lattice sandwich structure

2019 ◽  
Vol 39 (5-6) ◽  
pp. 209-218
Author(s):  
Shuguang Li ◽  
Runsheng Hu ◽  
Jin Cheng ◽  
Yingcheng Hu
Keyword(s):  
Sandwich Structure ◽  
Failure Modes ◽  
Shear Failure ◽  
Jute Fiber ◽  
Factors Affecting ◽  
Specific Strength ◽  
Out Of Plane ◽  
Theoretical Predictions ◽  
Shear Buckling ◽  
The Cost

A lattice sandwich structure mainly consisting of jute fiber and resin epoxy was prepared. Two configurations were established, and six out-of-plane compression experiments were conducted to identify the factors affecting the mechanical properties of the samples. The specific strength of the 2D corrugated lattice truss with the struts at 30° (I1) was 3 times stronger than that of the sample with sandwich struts at 45°. The specific strength of I1 was 3.9 times stronger than that of the Kagome structure prepared using Cu–2%Be. The cost performance with respect to the specific strength of the structure I1 was 161.7 times higher than that of the Kagome structure prepared using Cu–2%Be. Three failure modes were considered, and theoretical predictions were made separately. The failure modes in the experiment were mainly shear failure and shear buckling failure in sandwich struts.

Study on Transverse Shear Behavior of CFRP Sandwich Structure with M-Pattern Folded Core

2014 ◽  
Vol 670-671 ◽  
pp. 173-176 ◽  
Author(s):  
Li Xin Cong ◽  
Yu Guo Sun
Keyword(s):  
Relative Density ◽  
Sandwich Structure ◽  
Failure Modes ◽  
Pure Shear ◽  
Shear Loading ◽  
Bonding Performance ◽  
The Face ◽  
Folded Core ◽  
Shear Buckling ◽  
Failure Loads

In order to solve the problem of the face/core bonding performance of the sandwich structure, this paper proposed a M - pattern folded sandwich structure. Structural performance in direct (pure) shear was investigated for sandwich structure. FE-Analytical of sandwich structure strength under shear loading condition was presented for possible failure modes. Panels with core of different thickness were tested for different failure modes and the mechanical properties. In general, the measured failure loads showed good agreement with the FE-analytical predictions.The results shown that failure modes of the sandwich structure with low relative density were shear buckling and fracture of thin-walled of cores, respectively. For the sandwich structure with high relative density, the dominant failure mode was interfacial debonding of face/cores, and the initiating failure along the ends of the specimens.

scholarly journals Mechanical properties of the wood-based X-type lattice sandwich structure

BioResources ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 1927-1944 ◽  
Author(s):  
Tengteng Zheng ◽  
Yanpeng Cheng ◽  
Shuai Li ◽  
Yan Zhang ◽  
Yingcheng Hu
Keyword(s):  
Mechanical Properties ◽  
Failure Mode ◽  
Sandwich Structure ◽  
Shear Failure ◽  
Compressive Test ◽  
The Core ◽  
Short Beam ◽  
Out Of Plane ◽  
Beam Shear ◽  
Type Lattice

In this study, a wood-based X-type lattice sandwich structure was fabricated by an insertion glue method using medium density fiberboard (MDF) and plywood as panels. Birch was used for the core. The mechanical properties and failure modes of the wood-based X-type lattice sandwich structure were investigated by an out-of-plane compressive test, a short beam shear test, and their matching analytical models. The out-of-plane compressive test and the compression analytical model showed that the failure mode of the plywood and birch combination was mainly shear failure in the core. The cores were broken or had sliding surfaces, while the failure mode of the MDF and birch combination was mainly shear failure of the core at both ends. Although the compression properties of the MDF and birch combination were better, the specific strength and modulus of the plywood and birch combination was larger, which align with the characteristics of lightweight and strong strength. The failure mode of the plywood and birch combination was delamination at both ends of the panel or core breakage, which indicated that this combination had better short beam shear properties. The theoretical models of the compressive /short beam shear properties were in good agreement with experimental results obtained for the plywood and birch combination.

Compression behavior and failure modes of wood-based lattice core sandwich structure with improved relative density

2021 ◽  
pp. 073168442110093
Author(s):  
Lifeng Wang ◽  
Yingcheng Hu ◽  
Shuai Li ◽  
Gaoyuan Ye ◽  
Zelong Li
Keyword(s):  
Relative Density ◽  
Sandwich Structure ◽  
Failure Modes ◽  
High Strength ◽  
Test Results ◽  
Plate Structures ◽  
Compression Behavior ◽  
Potential Applications ◽  
Shear Buckling ◽  
Lattice Core

In response to growing interest in lightweight, high-strength wood-based engineering materials, a lattice core sandwich structure made of plywood and birch dowels with improved relative density in its core was designed and fabricated. Flatwise and edgewise compressive experiments were performed to investigate the mechanical behavior of the sandwich structure. The effect of relative density on the mechanical properties and failure mode of the structure under flatwise compression was discussed. The theoretical and experimental flatwise compression test results showed good agreement. The results of the edgewise compressive tests of the sandwich structure indicated that face sheet wrinkling, crushing, and macro-shear buckling of the core were the main failure modes. The wood-based lattice sandwich structure has potential applications in the construction industry as beam and plate structures for buildings.

Fabrication, testing, and analysis of sandwich structure with composite skin and additive manufactured core

2021 ◽  
pp. 073168442199588
Author(s):  
Dooyoul Lee ◽  
Hyeok-Jun Kwon ◽  
Seongun Yang ◽  
Min-Saeng Kim
Keyword(s):  
Sandwich Structure ◽  
Fused Deposition Modeling ◽  
Failure Modes ◽  
Three Point Bending ◽  
Fused Deposition ◽  
Out Of Plane ◽  
Different Temperatures ◽  
Deposition Modeling ◽  
Ductile To Brittle Transition ◽  
Skin Wrinkling

The mechanical behavior of a sandwich structure made of woven glass/epoxy skins and an additive manufactured (AM) core was studied. The AM core was fabricated using polyetherimide and fused deposition modeling. This combination was chosen to increase the out-of-plane strength of an AM aircraft part. Tensile, flexural, and puncture tests were conducted for both the AM core and sandwich structure. The behavior of the beams was governed by the skins; however, the effect of the AM core for one-sided beams was significant. The tensile strength predicted by the simple mixture rule was in good agreement with the experimental results. For the flexural test specimen, sandwich beams were tested under three-point bending. The addition of composite skins increased the elastic modulus and flexural strength in both directions. The prevalent failure modes were skin wrinkling and core failure, and failure of the compressive skin was more likely. Puncture tests were conducted at three different temperatures. Owing to the increased bending stiffness, the sandwich structure did not exhibit ductile-to-brittle transition behavior.

Experimental Research on Out-of-Plane Cyclic Behavior of Steel-Plate Composite Walls

2016 ◽  
Vol 10 (01) ◽  
pp. 1650001 ◽  
Author(s):  
Yue Yang ◽  
Jingbo Liu ◽  
Xin Nie ◽  
Jiansheng Fan
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Steel Plate ◽  
Plate Thickness ◽  
Steel Plates ◽  
Hysteretic Behavior ◽  
Cyclic Behavior ◽  
Shear Span ◽  
Out Of Plane ◽  
Composite Walls

Three steel-plate composite walls were tested under reversal loads. The primary purpose of this experiment was to investigate the out-of-plane behavior of steel-plate composite walls under seismic actions, including the failure modes, hysteretic behavior, strength, and stiffness while emphasizing the effects of shear span, connection details, and thickness of the steel plates. All specimens showed some pinching effect in the hysteresis loops. Both shear failure and flexural failure occurred in the tests depending on the shear span and steel plate thickness of the specimens. All surface steel plates of the specimens remained unbuckled before yielding during the loading process, which indicated that the ratio of connector spacing to surface steel plate thickness adopted for the specimens satisfied the requirement of yielding before buckling. The test results also showed that the tie bars contributed significantly to the out-of-plane shear strength of the steel-plate composite walls.

scholarly journals Factors Affecting the Rate of Fuel Consumption in Aircrafts

2021 ◽  
Vol 13 (14) ◽  
pp. 8066
Author(s):  
Thowayeb H. Hassan ◽  
Abu Elnasr E. Sobaih ◽  
Amany E. Salem
Keyword(s):  
Fuel Consumption ◽  
Positive Association ◽  
Pollutant Emissions ◽  
Aviation Industry ◽  
Factors Affecting ◽  
Fuel Flow ◽  
Homogeneity Of Variance ◽  
Strong Positive Association ◽  
Ground Distance ◽  
The Cost

The cost of fuel and its availability are among the most major concerns for aircrafts and the aviation industry overall. Environmental difficulties with chemical pollutant emissions emitted by aviation machines are also connected to fuel consumption. As a result, it is crucial to examine factors that affect the overall fuel usage and consumption in the airport-based aviation industry. Several variables were investigated related to the total fuel consumed, such as dry operating weight (DOW) (KG), zero-fuel weight (ZFW), take-off weight (TOW), air distance (AIR DIST) (KM), and ground distance (GDN DIST). Analysis of the correlation between total fuel consumed as well as the extra fuel and selected variables was conducted. The results showed that the most positively associated factors with the total used fuel were the air distance (r2 = 0.86, p < 0.01), ground distance (r2 = 0.78, p < 0.01), TOW (r2 = 0.68, p < 0.01), and flight time (r2 = 0.68, p < 0.01). There was also a strong positive association between the average fuel flow (FF) and actual TOW (r2 = 0.74, p < 0.01) as well as ZFW (r2 = 0.61, p < 0.01). The generalized linear model (GLM) was utilized to assess the predictions of total energy usage after evaluating important outliers, stability of the homogeneity of variance, and the normalization of the parameter estimation. The results of multiple linear regression revealed that the most significant predictors of the total consumed fuel were the actual ZFW (p < 0.01), actual TOW (p < 0.01), and actual average FF (p < 0.05). The results interestingly confirmed that wind speed has some consequences and effects on arrival fuel usage. The result reflects that thermal and hydrodynamic economies impact on the flying fuel economy. The research has various implications for both scholars and practitioners of aviation industry.

scholarly journals Economic burden of childhood diarrhea in Burundi

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Fulgence Niyibitegeka ◽  
Arthorn Riewpaiboon ◽  
Sitaporn Youngkong ◽  
Montarat Thavorncharoensap
Keyword(s):  
Economic Burden ◽  
Cost Model ◽  
Primary Treatment ◽  
Management Program ◽  
Community Based ◽  
Factors Affecting ◽  
Hospitalization Costs ◽  
Illness Study ◽  
The Cost ◽  
Substantial Economic Burden

Abstract Background In 2016, diarrhea killed around 7 children aged under 5 years per 1000 live births in Burundi. The objective of this study was to estimate the economic burden associated with diarrhea in Burundi and to examine factors affecting the cost to provide economic evidence useful for the policymaking about clinical management of diarrhea. Methods The study was designed as a prospective cost-of-illness study using an incidence-based approach from the societal perspective. The study included patients aged under 5 years with acute non-bloody diarrhea who visited Buyenzi health center and Prince Regent Charles hospital from November to December 2019. Data were collected through interviews with patients’ caregivers and review of patients’ medical and financial records. Multiple linear regression was performed to identify factors affecting cost, and a cost model was used to generate predictions of various clinical and care management costs. All costs were converted into international dollars for the year 2019. Results One hundred thirty-eight patients with an average age of 14.45 months were included in this study. Twenty-one percent of the total patients included were admitted. The average total cost per episode of diarrhea was Int$109.01. Outpatient visit and hospitalization costs per episode of diarrhea were Int$59.87 and Int$292, respectively. The costs were significantly affected by the health facility type, patient type, health insurance scheme, complications with dehydration, and duration of the episode before consultation. Our model indicates that the prevention of one case of dehydration results in savings of Int$16.81, accounting for approximately 11 times of the primary treatment cost of one case of diarrhea in the community-based management program for diarrhea in Burundi. Conclusion Diarrhea is associated with a substantial economic burden to society. Evidence from this study provides useful information to support health interventions aimed at prevention of diarrhea and dehydration related to diarrhea in Burundi. Appropriate and timely care provided to patients with diarrhea in their communities and primary health centers can significantly reduce the economic burden of diarrhea. Implementing a health policy to provide inexpensive treatment to prevent dehydration can save significant amount of health expenditure.

scholarly journals Materials for Automotive Lightweighting

2019 ◽  
Vol 49 (1) ◽  
pp. 327-359 ◽  
Author(s):  
Alan Taub ◽  
Emmanuel De Moor ◽  
Alan Luo ◽  
David K. Matlock ◽  
John G. Speer ◽  
...  
Keyword(s):  
Galvanic Corrosion ◽  
Low Carbon Steel ◽  
High Strength Steels ◽  
High Strength ◽  
Low Carbon ◽  
New Materials ◽  
Specific Strength ◽  
Advanced High Strength Steels ◽  
Strength And Stiffness ◽  
The Cost

Reducing the weight of automobiles is a major contributor to increased fuel economy. The baseline materials for vehicle construction, low-carbon steel and cast iron, are being replaced by materials with higher specific strength and stiffness: advanced high-strength steels, aluminum, magnesium, and polymer composites. The key challenge is to reduce the cost of manufacturing structures with these new materials. Maximizing the weight reduction requires optimized designs utilizing multimaterials in various forms. This use of mixed materials presents additional challenges in joining and preventing galvanic corrosion.

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