scholarly journals Experimental Investigation on the Influence of Fiber Path Curvature on the Mechanical Properties of Composites

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2602
Author(s):  
Huaqiao Wang ◽  
Jihong Chen ◽  
Zhichao Fan ◽  
Jun Xiao ◽  
Xianfeng Wang
Keyword(s):  
Tensile Strength ◽  
Path Planning ◽  
Composite Laminates ◽  
Bending Strength ◽  
High Strength ◽  
Bending Test ◽  
Fiber Placement ◽  
Automated Fiber Placement ◽  
Fiber Path ◽  
Path Curvature

Automated fiber placement (AFP) has been widely used as an advanced manufacturing technology for large and complex composite parts and the trajectory planning of the laying path is the primary task of AFP technology. Proposed in this paper is an experimental study on the effect of several different path planning placements on the mechanical behavior of laminated materials. The prepreg selected for the experiment was high-strength toughened epoxy resin T300 carbon fiber prepreg UH3033-150. The composite laminates with variable angles were prepared by an eight-tow seven-axis linkage laying machine. After the curing process, the composite laminates were conducted by tensile and bending test separately. The test results show that there exists an optimal planning path among these for which the tensile strength of the laminated specimens decreases slightly by only 3.889%, while the bending strength increases greatly by 16.68%. It can be found that for the specific planning path placement, the bending strength of the composite laminates is significantly improved regardless of the little difference in tensile strength, which shows the importance of path planning and this may be used as a guideline for future AFP process.

Two-Stage Sector Partition Path Planning Method for Automated Fiber Placement on Complex Surfaces

2021 ◽  
Vol 132 ◽  
pp. 102983
Author(s):  
Jiaxin Gao ◽  
Weiwei Qu ◽  
Di Yang ◽  
Weidong Zhu ◽  
Yinglin Ke
Keyword(s):  
Path Planning ◽  
Planning Method ◽  
Complex Surfaces ◽  
Two Stage ◽  
Fiber Placement ◽  
Automated Fiber Placement

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

2015 ◽  
Vol 22 (2) ◽  
pp. 157-163 ◽  
Author(s):  
Mahdi Arian Nik ◽  
Larry Lessard ◽  
Damiano Pasini
Keyword(s):  
Variable Stiffness ◽  
Buckling Load ◽  
Fiber Placement ◽  
Plate Size ◽  
Load Increase ◽  
Automated Fiber Placement ◽  
Fiber Path ◽  
Turning Radius ◽  
Curvilinear Fibers ◽  
Minimum Turning Radius

AbstractVariable stiffness laminates can be manufactured using curvilinear fiber paths. A curvilinear fiber path is generally defined based on the plate size and has a curvature that is dependent on the plate size. In practice, however, the fiber path must satisfy manufacturing constraints, such as the minimum turning radius imposed by the automated fiber placement machine, thereby limiting the possible amount of fiber steering. In this work, we studied the effect of the plate size on the structural properties of a plate manufactured with curvilinear fibers. We considered four plate sizes, which were designed by a constant curvature fiber path. We optimized the plates for both maximum buckling load and in-plane stiffness. The results showed that the in-plane stiffness of the plate was not controlled by the plate size, whereas the buckling load was highly affected by the curvature of the fiber path. Hence, the potential of a buckling load increase reduced for plate sizes smaller than the minimum turning radius. In addition, for a given maximum curvature of the fiber path, the influence of a complex layup on the buckling load was marginal.

Preparation of polylactic acid composites containing β–Ca(PO3)2 fibers

1999 ◽  
Vol 14 (2) ◽  
pp. 418-424 ◽  
Author(s):  
Toshihiro Kasuga ◽  
Haruhiko Fujikawa ◽  
Yoshihiro Abe
Keyword(s):  
Modulus Of Elasticity ◽  
Bending Strength ◽  
Methylene Chloride ◽  
High Strength ◽  
High Energy ◽  
Fiber Content ◽  
Bending Test ◽  
Natural Bone ◽  
Naoh Solution ◽  
Very High Energy

Novel biomaterials for application to artificial bone with modulus of elasticity close to that of natural bone were prepared using bioresorbable poly-L-lactic acid (PLLA) and high-strength β–Ca(PO3)2 fibers treated with dilute NaOH solution. PLLA dissolved by using methylene chloride was mixed with the fibers. After drying the mixture, it was hot-pressed uniaxially under a pressure of 40 MPa at 180 °C, resulting in fabrication of a PLLA composite containing β–Ca(PO3)2 fibers. Almost no degradation in the bending strength was observed even when a large amount of the fibers (≈50 wt. %) was introduced, and the modulus of elasticity was increased effectively with increasing the fiber content. The PLLA composite with modulus of elasticity of <5 GPa similar to that of natural bone was found to be prepared when the fiber content was over 35 wt. %. The bending test of the composites showed that very high energy is consumed for their fracture and that the fracture proceeds step by step, even beyond the maximum stress.

scholarly journals Structural Behavior of High Strength Laced Reinforced Concrete One Way Slab Exposed to Fire Flame

2019 ◽  
Vol 5 (12) ◽  
pp. 2747-2761
Author(s):  
Anas Ibrahim Abdullah
Keyword(s):  
Reinforced Concrete ◽  
Bending Strength ◽  
High Strength ◽  
Bending Test ◽  
Structural Members ◽  
Four Point Bending ◽  
Steady State Temperature ◽  
Average Residual ◽  
Fire Flame ◽  
Geometric Layout

In this study, an experimental investigation had conducted for six high strength laced reinforced concrete one-way slabs to discover the behavior of laced structural members after being exposed to fire flame (high temperature). Self-compacted concrete (SCC) had used to achieve easy casting and high strength concrete. All the adopted specimens were identical in their compressive strength of ( , geometric layout 2000 750 150 mm and reinforcement specifics except those of lacing steel content, three ratios of laced steel reinforcement of (0.0021, 0.0040 and 0.0060) were adopted. Three specimens were fired with a steady state temperature of  for two hours duration and then after the specimens were cooled suddenly by spraying water. The simply supported slabs were tested for flexure behavior with two line loads applied in the middle third of the slab (four-point bending test). The average residual percentage of cubic compression strength and splitting tensile strength were 57.5% and 50% respectively. The outcomes indicated that the residual bending strength of the burned slabs with laced ratios (0.0021, 0.004, 0.006) were (72.56, 70.54 and 70.82%) respectively. However; an increase in the deflection was gained to be (11.34, 14.67 and 17.22%) respectively with respect to non-burned specimens.

scholarly journals Static and thermal behaviour of ship structure sandwich panels

2019 ◽  
pp. 463-463
Author(s):  
Nicușor Baroiu ◽  
Elena Beznea ◽  
Gelu Coman ◽  
Ionel Chirică
Keyword(s):  
Composite Laminates ◽  
Thermal Loading ◽  
Bending Strength ◽  
Sandwich Panels ◽  
Bending Test ◽  
Maximum Displacement ◽  
Element Analysis ◽  
Ship Structure ◽  
Composite Sandwich ◽  
Glass Fiber Reinforced

The mechanical properties of certain flexible core materials of ship structure sandwich panels, having skins made of metallic or composite laminates may be significantly influenced by the temperature variations that may occur during the operational loading. At the same time, the improving knowledge of the behaviour of these panels in terms of bending strength and other stress / strain related aspects in various harsh conditions increases their superiority in terms of weight-to-strength ratio, high stiffness, easy to manufacture, acoustic and thermal insulation. In the paper, the behaviour of the ship structural rectangular sandwich panels to the mechanical and thermal loading are presented. The sandwiches have a special core of 20 mm and skins made out of different materials (glass fiber reinforced polyester, steel and aluminium) with a thickness of 3 mm. Analysis consists of the behaviour of the composite sandwich panels in the bending test at constant speed by the three-point method, for three distances between different supports, by measuring the maximum displacement and force applied to the specimens under various thermal fields. The sandwich structures are also thermally analysed, determining their thermal conductivity by the heat flow measurement method. The experimental results are compared with the results obtained by finite element analysis in numerical simulation of all modelling cases.

Fatigue behavior of composite laminates with automated fiber placement induced defects- a review

2020 ◽  
Vol 140 ◽  
pp. 105775
Author(s):  
Pierre L. Chevalier ◽  
Christos Kassapoglou ◽  
Zafer Gürdal
Keyword(s):  
Composite Laminates ◽  
Fatigue Behavior ◽  
Fiber Placement ◽  
Automated Fiber Placement ◽  
Induced Defects

ANALISA KEKUATAN MEKANIS SAMBUNGAN LAS KAMPUH V TUNGGAL DAN V GANDA PADA BAJA KARBON RENDAH DENGAN PROSES PENGELASAN SMAW

2021 ◽  
Vol 12 (2) ◽  
pp. 103
Author(s):  
Sudarsono Sudarsono ◽  
Hidayat Hidayat ◽  
Aminur Aminur ◽  
Sarwo Pranoto ◽  
Prinob Aksar
Keyword(s):  
Tensile Strength ◽  
Bending Strength ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Bending Test ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Low Carbon ◽  
Shielded Metal Arc Welding ◽  
Metal Arc Welding

Welding is one of the methods widely used in the joining of metals for structural elements. One of the factors that influence the strength of welded metals is types of welding joints. Suitability of the type of welding joint with geometries of base metals is required to obtain welded metal products with optimum properties. In this study an attempt is made to investigate mechanical properties of welded metals with two different types of joints (single-V and double-V) using the shielded metal arc welding (SMAW) process. Low carbon steel with bevel angle of 60° was used in this study. Welding process was performed using current of 70 A with a constant welding speed. The flexural properties and uniaxial tensile properties are studied by three-point bending test and uniaxial tensile test respectively. Test results show that the tensile strength and the bending strength of single-V specimens is 521.64 N/mm2 and 525.11 N/mm2 respectively. In addition, the tensile strength and the bending strength of double-V specimens is 517.33 N/mm2 and  504.24 N/mm2 respectively

scholarly journals Optimizing Variable-Axial Fiber-Reinforced Composite Laminates: The Direct Fiber Path Optimization Concept

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Lars Bittrich ◽  
Axel Spickenheuer ◽  
José Humberto S. Almeida ◽  
Sascha Müller ◽  
Lothar Kroll ◽  
...  
Keyword(s):  
Composite Laminates ◽  
Variable Stiffness ◽  
Tensile Specimen ◽  
Path Optimization ◽  
Fiber Reinforced ◽  
Simulation And Optimization ◽  
Fiber Placement ◽  
Fiber Path ◽  
Curvilinear Fibers ◽  
Novel Concept

The concept of aligning reinforcing fibers in arbitrary directions offers a new perception of exploiting the anisotropic characteristic of the carbon fiber-reinforced polymer (CFRP) composites. Complementary to the design concept of multiaxial composites, a laminate reinforced with curvilinear fibers is called variable-axial (also known as variable stiffness and variable angle tow). The Tailored Fiber Placement (TFP) technology is well capable of manufacturing textile preforming with a variable-axial fiber design by using adapted embroidery machines. This work introduces a novel concept for simulation and optimization of curvilinear fiber-reinforced composites, where the novelty relies on the local optimization of both fiber angle and intrinsic thickness build-up concomitantly. This framework is called Direct Fiber Path Optimization (DFPO). Besides the description of DFPO, its capabilities are exemplified by optimizing a CFRP open-hole tensile specimen. Key results show a clear improvement compared to the current often used approach of applying principal stress trajectories for a variable-axial reinforcement pattern.

scholarly journals Biokomposit Limbah Plastik Polypropylene Berpenguat Serat Lidah Mertua: Proses Ekstraksi dan Kekuatan Mekanis

Jurnal METTEK ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 128
Author(s):  
I Putu Lokantara ◽  
Ngakan Putu Gede Suardana
Keyword(s):  
Tensile Strength ◽  
Tensile Testing ◽  
Bending Strength ◽  
Volume Fraction ◽  
Bending Test ◽  
Test Results ◽  
Hot Press ◽  
Soaking Time ◽  
Recycled Polypropylene ◽  
The Matrix

Tujuan dari penelitian ini adalah untuk menentukan kekuatan tarik dan kekuatan bending biokomposit limbah plastik polypropylene berpenguat serat lidah mertua. Lidah mertua yang digunakan adalah lidah mertua yang pinggirannya daunnya kuning dengan usia yang seragam. Daun lidah mertua direndam dengan metode water retting selama 7 hari dan proses ekstraksi serat dilakukan secara manual. Polypropylene daur ulang yang digunakan berasal dari limbah plastik minuman gelas. Perlakuan kimia serat lidah mertua dengan konsentrasi 5% NaOH dan waktu perendaman 2 jam. Komposit dicetak dengan menggunakan press panas dengan suhu 200oC dan waktu penahanan 2 jam. Komposit dilakukan pengujian tarik dengan menggunakan ASTM D-570 dan uji bending dengan ASTM 790-03. Hasil uji tarik menunjukkan bahwa kekuatan tarik tertinggi pada fraksi volume 35% sebesar 71,606 MPa. Kekuatan tarik meningkat sebesar 28,9% dari fraksi volume 25% ke fraksi volume 35%.  Hasil uji bending menunjukkan bahwa kekuatan bending tertinggi pada fraksi volume 35% sebesar 74,55 MPa. Kekuatan bending meningkat sebesar 22,9% dari fraksi volume 25% ke fraksi volume 35%. Dengan pengamatan foto mikro SEM, ikatan adhesi antara serat dan matrik terjadi dengan baik pada fraksi volume 35%.      The purpose of this study was to determine the tensile strength and bending strength of lidah mertua fiber reinforced polypropylene. Lidah mertua is used whose leaf margins are yellow with a uniform age. Lidah mertua leaves were soaked by water retting method for 7 days. Fiber is extracted manually by hand. Recycled polypropylene used comes from glass beverage plastic waste. The chemical treatment of lidah mertua fibers 5% NaOH and a soaking time of 2 hours. Composites are molded using a hot press with a temperature of 200oC and a holding time of 2 hours. Composite tensile testing was carried out using ASTM D-570 and bending test with ASTM 790-03. Tensile test results showed that the highest tensile strength at 35% volume fraction was 71,606 MPa. Tensile strength increased by 28.9% from 25% volume fraction to 35% volume fraction. Bending test results showed that the highest bending strength at 35% volume fraction was 74.55 MPa. The bending strength increased by 22.9% from the 25% volume fraction to the 35% volume fraction. By observing SEM micro photographs, the bond between the fiber and the matrix occurs well at 35% volume fraction

Sign in / Sign up

Export Citation Format

Share Document