In-plane compression modulus and strength of Nomex honeycomb cores

2021 ◽  
pp. 109963622110218
Author(s):  
Mustafa O Ayanoglu ◽  
Mohammad Tauhiduzzaman ◽  
Leif A Carlsson
Keyword(s):  
Bending Strength ◽  
Compression Modulus ◽  
Thin Wall ◽  
Test Results ◽  
Average Modulus ◽  
Shear Type ◽  
Plane Compression ◽  
Nomex Honeycomb ◽  
Honeycomb Cores ◽  
Vertical Cell

The stress-strain response and deformation mechanism of a range of Nomex honeycomb cores tested under in-plane compression has been examined experimentally. The cores with a thin wall displayed extensive bending deformation of the cell walls inclined to the horizontal (loading is vertical) and failed in bending. The cores with thicker walls failed by a shear-type instability of the cells indicated by tilting of vertical cell wall segments. The failure strain decreased with increasing core density. The modulus and compressive strength of the core were compared to micromechanical predictions. Normalized modulus and strength values varied between the various cores. The average modulus and strength results allow backing out of the modulus and bending strength of the Nomex paper. The results were in reasonable agreement with published tensile test results and composite micromechanics.

Study on ultrasonic vibration–assisted cutting of Nomex honeycomb cores

2019 ◽  
Vol 104 (1-4) ◽  
pp. 979-992 ◽  
Author(s):  
Di Kang ◽  
Ping Zou ◽  
Hao Wu ◽  
Jingwei Duan ◽  
Wenjie Wang
Keyword(s):  
Ultrasonic Vibration ◽  
Nomex Honeycomb ◽  
Honeycomb Cores

scholarly journals Testing and Assessing Method for the Resistance of Wood-Plastic Composites to the Action of Destroying Fungi

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 697
Author(s):  
Anna Wiejak ◽  
Barbara Francke
Keyword(s):  
Bending Strength ◽  
Test Results ◽  
Negative Effects ◽  
Destructive Effect ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Wood Polymer ◽  
Proposed Modification ◽  
Assessing Method ◽  
Biological Corrosion

Durability tests against fungi action for wood-plastic composites are carried out in accordance with European standard ENV 12038, but the authors of the manuscript try to prove that the assessment of the results done according to these methods is imprecise and suffers from a significant error. Fungi exposure is always accompanied by high humidity, so the result of tests made by such method is always burdened with the influence of moisture, which can lead to a wrong assessment of the negative effects of action fungus itself. The manuscript has shown a modification of such a method that separates the destructive effect of fungi from moisture accompanying the test’s destructive effect. The functional properties selected to prove the proposed modification are changes in the mass and bending strength after subsequent environmental exposure. It was found that intensive action of moisture measured in the culture chamber of about (70 ± 5)%, i.e., for 16 weeks, at (22 ± 2) °C, which was the fungi culture, which was accompanying period, led to changes in the mass of the wood-plastic composites, amounting to 50% of the final result of the fungi resistance test, and changes in the bending strength amounting to 30–46% of the final test result. As a result of the research, the correction for assessing the durability of wood-polymer composites to biological corrosion has been proposed. The laboratory tests were compared with the products’ test results following three years of exposure to the natural environment.

scholarly journals Excellent Mechanical Properties of the Silicate Glasses Modified by CeO2 and TiO2: A New Choice for High-Strength and High-Modulus Glass Fibers

2021 ◽  
Author(s):  
Chao Chen ◽  
Qingong Zhu ◽  
Huanping Wang ◽  
Feifei Huang ◽  
Qinghua Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silicate Glass ◽  
Optical Fibers ◽  
Bending Strength ◽  
Glass Fibers ◽  
High Strength ◽  
Maximum Level ◽  
Compression Modulus ◽  
Co Doping ◽  
Optimum Approach

Abstract As is well known, silicate glass has a stable glass-forming region and mature drawing processes into fibers. In this study, to obtain enhanced mechanical properties, glasses with a composition of SiO2-Al2O3-MgO-CaO-B2O3-Fe2O3 were synthesized using TiO2 and CeO2. When the amount of TiO2 and CeO2 is less than 2 wt%, the mechanical properties increase with increases in the TiO2 and CeO2. However, as the amount of TiO2 and CeO2 increases from 2 to 3.5 wt%, the mechanical properties decrease. Co-doping with 1 wt% TiO2 and 1 wt% CeO2 was found to be the optimum approach, with a density, bending strength, compression strength, and compression modulus of 2.626 g/cm3, 108.36 MPa, 240.18 MPa, and 115.03 GPa, respectively. The optical band gap and Raman spectroscopy proved that, as long as the content of oxygen bonds reaches the maximum level, a kind of best structural stability and mechanical properties will be achieved. Hence, this type of high-strength silicate glass can be used in optical fibers for military defense, wind power generation, and transportation.

scholarly journals STUDI KUAT LENTUR BETON DENGAN BAHAN TAMBAH SERAT ABAKA

Teras Jurnal ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 53
Author(s):  
Yudi Pranoto ◽  
Lina Halim ◽  
Anung Sudibyo
Keyword(s):  
Flexural Strength ◽  
Bending Strength ◽  
Fiber Content ◽  
Mix Design ◽  
Fine Aggregate ◽  
Test Results ◽  
Concrete Mix Design ◽  
Banana Tree ◽  
Flexible Fiber ◽  
Test Objects

<p align="center"><strong>Abstrak</strong></p><p> </p><p class="11daftarpustaka">Serat abaka merupakan serat yang awet dan lentur yang diambil dari pohon pisang. Serat ini masih sangat jarang dimanfaatkan, sementara di Indonesia serat abaka bisa ditemukan di mana mana. Tujuan penelitian ini adalah untuk mengetahui sejauh mana pengaruh serat abaka terhadap kuat lentur beton. Penelitian ini diawali dengan studi literature, pengujian material (Agregat halus, agregat kasar, semen dan serat abaka), mix design beton, pembuatan benda uji, perawatan dan dilanjutkan dengan pengujian kuat lentur beton serta terakhir dilakukan analisis hasil pengujian. Dari hasil pengujian didapatkan kuat lentur maksmum terjadi pada kadar serat abaka sebesar 0,6% dengan kuat lentur 3,75 MPa, sedangkan kuat lentur terkecil terjadi pada kadar serat abaka 0% dengan kuat lentur 3,34 MPa.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Kata kunci: <em>serat abaka,</em><em> kuat lentur, mix deisgn</em><em></em></p><p align="center"><strong> </strong></p><p align="center"><strong> </strong></p><p align="center"><strong>Abstract</strong></p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Abaca fiber is a durable and flexible fiber taken from the banana tree. This fiber is still very rarely used, while in Indonesian abaca fiber can be found everywhere. The purpose of this study was to determine the extent of the influence of abaca fiber on the flexural strength of concrete. This research begins with literature studies, material testing (fine aggregate, coarse aggregate, cement, and abaca fiber), concrete mix design, manufacture of test objects, curing, and continues with concretes flexural strength testing and finally an analysis of the test results. From the test results, it founded that the maximum flexural strength occurred at the abaca fiber content of 0.6% with a bending strength of 3.75 MPa, and the smallest flexural strength occurred at 0% abaca fiber content with a flexural strength of 3.34 MPa.</p><p class="11daftarpustaka"> </p><p class="11daftarpustaka">Keywords: <em>Abaka fiber,</em><em> flexural strength, mix design</em><em></em></p>

scholarly journals EFFECT OF CALCIUM SULFOALUMINATE ADDITIVE ON LINEAR DEFORMATION AT DIFFERENT HUMIDITY AND STRENGTH OF CEMENT MORTARS

2020 ◽  
Author(s):  
Kadhim Abdulwahid Al-Musawi ◽  
Kottayil Bindhu Abraham ◽  
Tatsiana Potses ◽  
Sergey Leonovich ◽  
Natallia Kalinouskaya ◽  
...  
Keyword(s):  
Bending Strength ◽  
High Humidity ◽  
Test Results ◽  
High Quality ◽  
Linear Deformation ◽  
Calcium Sulfoaluminate ◽  
Environmental Humidity ◽  
Cement Mortars ◽  
Under Construction ◽  
Very High

The effect of calcium sulfoaluminate additives (CSA) on the compression and bending strength of mortar, as well as linear deformation of prism samples at different environmental humidity was studied. Test results indicate that bending strength of mortars with CSA and the referent at the age of 28 days are practically equal. Compressive strength of mortars with CSA reduced by 20 ... 23% for all dosages of CSA. Relative linear deformations depend on the humidity of the environment. At a humidity of 100%, the relative linear deformations are positive and the expansion increases with increasing dosage of the expanding additive. When hardening in dry air at a humidity of 55%, the greatest shrinkage deformations were for mortars with CSA. We can conclude that the expanding effect of CSA is fully manifested at high humidity, i.e. under construction conditions, this means very high-quality moisture care for concrete structures.

Bending Strength of Al2O3 Ceramics for Textiles Machinery and Elastic Wave Characteristics by Wavelet Analysis

2007 ◽  
Vol 353-358 ◽  
pp. 345-348
Author(s):  
Ki Woo Nam ◽  
B.G. Ahn ◽  
M.K. Kim ◽  
C.S. Son ◽  
Jin Wook Kim ◽  
...  
Keyword(s):  
Elastic Wave ◽  
Bending Strength ◽  
Test Results ◽  
Composite Ceramics ◽  
Bending Tests ◽  
Three Point Bending ◽  
Wave Signal ◽  
Al2o3 Composite ◽  
Signal Characteristics ◽  
Optimized Conditions

The optimized conditions of pressureless sintering were investigated in order to obtain the bending strength and the elastic wave signal of Al2O3 composite ceramics for textiles machinery. As sintering conditions, a temperature range from 1400°C to 1700°C and time from 30 minutes to 150 minutes were applied. Three-point bending tests were conducted on the sintered materials to obtain the strength property. From the test results, the optimum sintering condition was 1600°C, 100 minutes. Al2O3 composite ceramics showed that the elastic wave signal characteristics had a regular correlativity between the optimum sintering temperature and time as well as the maximum bending strength.

scholarly journals Fracture Toughness Analysis of Epoxy-Recycled Rubber-Based Composite Reinforced with Graphene Nanoplatelets for Structural Applications in Automotive and Aeronautics

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 448 ◽  
Author(s):  
Alaeddin Burak Irez ◽  
Emin Bayraktar ◽  
Ibrahim Miskioglu
Keyword(s):  
Fracture Toughness ◽  
Building Materials ◽  
Bending Strength ◽  
Mechanical Test ◽  
Graphene Nanoplatelets ◽  
Test Results ◽  
Toughening Mechanisms ◽  
Structural Applications ◽  
Recycled Rubber ◽  
Cost Efficient

This study proposes a new design of lightweight and cost-efficient composite materials for the aeronautic industry utilizing recycled fresh scrap rubber, epoxy resin, and graphene nanoplatelets (GnPs). After manufacturing the composites, their bending strength and fracture characteristics were investigated by three-point bending (3PB) tests. Halpin–Tsai homogenization adapted to composites containing GnPs was used to estimate the moduli of the composites, and satisfactory agreement with the 3PB test results was observed. In addition, 3PB tests were simulated by finite element method incorporating the Halpin–Tsai homogenization, and the resulting stress–strain curves were compared with the experimental results. Mechanical test results showed that the reinforcement with GnPs generally increased the modulus of elasticity as well as the fracture toughness of these novel composites. Toughening mechanisms were evaluated by SEM fractography. The typical toughening mechanisms observed were crack deflection and cavity formation. Considering the advantageous effects of GnPs on these novel composites and cost efficiency gained by the use of recycled rubber, these composites have the potential to be used to manufacture various components in the automotive and aeronautic industries as well as smart building materials in civil engineering applications.

Study on Durability of High Bending Strength Pavement Concrete

2012 ◽  
Vol 594-597 ◽  
pp. 1372-1376
Author(s):  
Wei Hong Guo
Keyword(s):  
Wear Resistance ◽  
Bending Strength ◽  
Drying Shrinkage ◽  
Fatigue Property ◽  
Plain Concrete ◽  
Shrinkage Strain ◽  
Test Results ◽  
Concrete Material ◽  
Shrinkage Coefficient ◽  
Pavement Concrete

In order to explore the durability of high bending strength pavement concrete, adding silica flour, fibrous reticulum, SD emulsion and HG emulsion separately in concrete mixture, the shrinkage characteristic, wear resistance and fatigue property of different high bending strength pavement concrete are tested, and contrastive analysis with the plain concrete material is researched. The test results show that the early contraction of HBSPC is bigger, but the total drying shrinkage strain is smaller than plain concrete, and the drying shrinkage stable stage of HBSPC is shorter than plain concrete. The temperature shrinkage of HBSPC and plain concrete is uniform basically, the temperature shrinkage coefficient of HBSPC is lower than the plain concrete in the negative warm area and warm area, but it is higher in 0 °C neighbor. The mixtures of the material enhance the wear resistance and fatigue property of concrete.

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