scholarly journals Tensile Properties and Fracture Behaviour of Biodegradable Iron–Manganese Scaffolds Produced by Powder Sintering

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1572
Author(s):  
A. Dehghan-Manshadi ◽  
D.H. StJohn ◽  
M.S. Dargusch
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Tensile Properties ◽  
Fracture Behaviour ◽  
Austenite Phase ◽  
Orthopaedic Implant ◽  
Biodegradable Implant ◽  
Powder Sintering ◽  
Iron Manganese ◽  
Interconnected Pores

Powder sintering at 1200 °C for 180 min was used to produce Fe–Mn based alloys with tensile properties and an elastic modulus suitable for biodegradable implant applications. The effect of the addition of manganese on the microstructure, tensile properties and fracture behaviour of the Fe–Mn alloys was investigated. The Fe–35Mn alloy with a microstructure dominated by the Austenite phase showed the best set of tensile properties, including ultimate tensile strength and Young’s modulus, suitable for orthopaedic implant applications. The fracture surface of the Fe–35Mn alloy showed signs of complex multimode fracture behaviour, consisting of interconnected pores and large segments with signs of ductile fracture, including the presence of dimples as well as micro-voids.

Impact of Process Parameters on the Tensile Properties of DLP Additively Manufactured ELAST-BLK 10 UV-Curable Elastomer

2021 ◽  
Author(s):  
Asma Ul Hosna Meem ◽  
Kyle Rudolph ◽  
Allyson Cox ◽  
Austin Andwan ◽  
Timothy Osborn ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Process Parameters ◽  
Uv Light ◽  
Uv Curable ◽  
Build Orientation ◽  
Static Tensile ◽  
The Impact

Abstract Digital light processing (DLP) is an emerging vatphotopolymerization-based 3D-printing technology where full layers of photosensitive resin are irradiated and cured with projected ultraviolet (UV) light to create a three-dimensional part layer-by-layer. Recent breakthroughs in polymer chemistry have led to a growing number of UV-curable elastomeric photoresins developed exclusively for vat photopolymerization additive manufacturing (AM). Coupled with the practical manufacturing advantages of DLP AM (e.g., industry-leading print speeds and sub-micron-level print resolution), these novel elastomeric photoresins are compelling candidates for emerging applications requiring extreme flexibility, stretchability, conformability, and mechanically-tunable stiffness (e.g., soft robotic actuators and stretchable electronics). To advance the role of DLP AM in these novel and promising technological spaces, a fundamental understanding of the impact of DLP manufacturing process parameters on mechanical properties is requisite. This paper highlights our recent efforts to explore the process-property relationship for ELAST-BLK 10, a new commercially-available UV-curable elastomer for DLP AM. A full factorial design of experiments is used to investigate the effect of build orientation and layer thickness on the quasi-static tensile properties (i.e., small-strain elastic modulus, ultimate tensile strength, and elongation at fracture) of ELAST-BLK 10. Statistical results, based on a general linear model via ANOVA methods, indicate that specimens with a flat build orientation exhibit the highest elastic modulus, ultimate tensile strength, and elongation at fracture, likely due to a larger surface area that enhances crosslink density during the curing process. Several popular hyperelastic constitutive models (e.g., Mooney-Rivlin, Yeoh, and Gent) are calibrated to our quasi-static tensile data to facilitate component-level predictive analyses (e.g., finite-element modeling) of soft robotic actuators and other emerging soft-matter applications.

A fuzzy logic model for prediction of tensile properties of epoxy/glass fiber/silica nanocomposites

2017 ◽  
Vol 50 (6) ◽  
pp. 491-500 ◽  
Author(s):  
Sajjad Daneshpayeh ◽  
Amir Tarighat ◽  
Faramarz Ashenai Ghasemi ◽  
Mohammad Sadegh Bagheri
Keyword(s):  
Tensile Strength ◽  
Fuzzy Logic ◽  
Elastic Modulus ◽  
Glass Fiber ◽  
Tensile Properties ◽  
Fiber Content ◽  
Main Role ◽  
Elongation At Break ◽  
Silica Nanocomposites ◽  
Two Factors

The object of this work is to study and predict the tensile properties (tensile strength, elastic modulus, and elongation at break) of ternary nanocomposites based on epoxy/glass fiber/nanosilica using the fuzzy logic (FL). Two factors in three levels including glass fiber at 0, 5, and 10 wt% and nanosilica at 0, 0.5, and 1 wt% were chosen for adding to an epoxy matrix. From FL surfaces, it was found that the glass fiber content had a main role in the tensile properties of nanocomposites. The high levels of glass fiber content led to a significant increase in the elastic modulus and generally, the presence of glass fiber decreased the tensile strength and elongation at break. Also, addition of the nanosilica content resulted in an increased elastic modulus but decreased the elongation at break of nanocomposites. Finally, an FL model was obtained for each tensile property.

scholarly journals A systematic study on the synergistic effects of MWCNTs and core–shell particles on the physicomechanical properties of epoxy resin

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ali Gharieh ◽  
Mir Saeed Seyed Dorraji
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Epoxy Resin ◽  
Tensile Properties ◽  
Synergistic Effects ◽  
Average Particle Size ◽  
Physicomechanical Properties ◽  
Core Shell ◽  
Average Particle ◽  
Impact Modifier

AbstractHere, core–shell impact modifier particles (CSIMPs) and multiwalled carbon nanotubes (MWCNs) were used as reinforcing agents for improving the toughness and tensile properties of epoxy resin. For this purpose, emulsion polymerization technique was exploited to fabricate poly(butyl acrylate-allyl methacrylate) core-poly(methyl methacrylate-glycidyl methacrylate) shell impact modifier particles with an average particle size of 407 nm. It was revealed that using a combination of the prepared CSIMPs and MWCNTs could significantly enhance the toughness and tensile properties of the epoxy resin. Also, it was observed that the dominant factors for improving the fracture toughness of the ternary composites are crack deflection/arresting as well as enlarged plastic deformation around the growing crack tip induced by the combination of rigid and soft particles. The Response Surface Methodology (RSM) with central composite design (CCD) was utilized to study the effects of the amounts of CSIMPs and MWCNTs on the physicomechanical properties of the epoxy resin. The proposed quadratic models were in accordance with the experimental results with correlation coefficient more than 98%. The optimum condition for maximum toughness, elastic modulus, and tensile strength was 3 wt% MWCNT and 1.03 wt% CSIMPs. The sample fabricated in the optimal condition indicated toughness, elastic modulus, and tensile strength equal to 2.2 MPa m1/2, 3014.5 MPa, and 40.6 MPa, respectively.

scholarly journals Study on Tensile Properties of CFRP Plates under Elevated Temperature Exposure

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1995 ◽  
Author(s):  
Yongxin Yang ◽  
Yanju Jiang ◽  
Hongjun Liang ◽  
Xiaosan Yin ◽  
Yue Huang
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Elevated Temperature ◽  
Tensile Properties ◽  
Failure Mode ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Effect Of Temperature ◽  
Temperature Exposure ◽  
The Impact

Elevated temperature exposure has a negative effect on the performance of the matrix resin in Carbon Fiber Reinforced Plastics (CFRP) plates, whereas limited quantitative research focuses on the deteriorations. Therefore, 30 CFRP specimens were designed and tested under elevated temperatures (10, 30, 50, 70, and 90 °C) to explore the degradations in tensile properties. The effect of temperature on the failure mode, stress-strain curve, tensile strength, elastic modulus and elongation of CFRP plates were investigated. The results showed that elevated temperature exposure significantly changed the failure characteristics. When the exposed temperature increased from 10 °C to 90 °C, the failure mode changed from the global factures in the whole CFRP plate to the successive fractures in carbon fibers. Moreover, with temperatures increasing, tensile strength and elongation of CFRP plates decreases gradually while the elastic modulus shows negligible change. Finally, the results of One-Way Analysis of Variance (ANOVA) show that the degradation of the tensile strength of CFRP plates was due to the impact of elevated temperature exposure, rather than the test error.

scholarly journals Effects of Loop Density of Knitted Fabric Preform on the Tensile Properties of Composites

2004 ◽  
Vol 13 (3) ◽  
pp. 096369350401300
Author(s):  
Fan Zaixia ◽  
Zhangyu ◽  
Chen Yanmo ◽  
Long Hairu
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Tensile Properties ◽  
Failure Strain ◽  
Knitted Fabric ◽  
Commingled Yarns ◽  
Properties Of Composites

The effects of the loop density of knitted fabric preform made from GF/PP commingled yarns on the tensile properties of the composites are investigated. Six groups of composite specimens made from preforms with different loop densities are studied. It has been found that the elastic modulus and tensile strength of the composites show an increase followed by a slight decrease as the increase of the loop density of the preform, while the failure strain just changes totally contrarily.

Comparative Analysis of the Tensile Properties of Polyester and Epoxy Composites Reinforced with Hemp Fibers

2018 ◽  
Vol 930 ◽  
pp. 201-206
Author(s):  
Lazaro Araújo Rohen ◽  
Anna Carolina Cerqueira Neves ◽  
Jheison Lopes dos Santos ◽  
Lucio Fabio Cassiano Nascimento ◽  
Sergio Neves Monteiro ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Tensile Properties ◽  
Epoxy Matrix ◽  
Fiber Composites ◽  
Epoxy Composites ◽  
Matrix Composites ◽  
Hemp Fiber ◽  
Hemp Fibers ◽  
Polyester Matrix

The present work compares the tensile properties of polyester and epoxy matrix composites reinforced with hemp fibers. Polyester and epoxy reinforced with different volume fractions of hemp fibers up to 30% were prepared according to ASTM D-638-14 and tensile tested. The epoxy matrix composites reinforced with 30% of fibers presented tensile strength of 53 MPa, while those of polyester matrix, 25 MPa. The elastic modulus of the epoxy matrix composites was 1.75 GPa and that of the polyester matrix 4.05 GPa. The tests showed that the resistance of the epoxy composites reinforced with hemp fiber is superior to those of polyester matrix. However, the stiffness of the polyester/hemp fiber composites is higher than the epoxy/hemp fiber ones.

Study on the Effects of the Self-Healing Microcapsules on the Tensile Properties of Polymer Composite

2011 ◽  
Vol 299-300 ◽  
pp. 460-465 ◽  
Author(s):  
Li Zhang ◽  
Xiu Ping Dong ◽  
Hao Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Glass Fiber ◽  
Tensile Properties ◽  
Polymer Composite ◽  
Tensile Tests ◽  
The Self ◽  
Self Healing ◽  
Glass Fiber Reinforced

By designing different formulations of composites and adopting optimized technology including extrusion and molding, the different composites with various content microcapsules were prepared. The results of the tensile tests show that with the increasing content of self-healing microcapsules in the glass fiber reinforced nylon composites, the mechanical properties of the composites will change, i.e. tensile strength, elastic modulus will decrease. But there is little effect on the mechanical properties of the composite gears if the content of self-healing microcapsules is less than 3.5%, and the technology of self-healing microcapsules used in the polymer composite gear is feasible.

scholarly journals Tensile properties of PLA/PBAT blends and PLA fibre-reinforced PBAT composite

2018 ◽  
Vol 192 ◽  
pp. 03014 ◽  
Author(s):  
Eakasit Sritham ◽  
Phakaimat Phunsombat ◽  
Jedsada Chaishome
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Tensile Properties ◽  
Room Temperature ◽  
Dsc Measurements ◽  
Significant Difference ◽  
Two Phases

The tensile properties of PLA/PBAT blends, PLA fibre reinforced PBAT composite (PLAF) at room temperature and -18°C were investigated. The concentrations of PLA in the blends were 10%, 20%, 30% and 40% (by volume). There was an improvement of elastic modulus (E) for PLA/PBAT blends when PLA was 40%. There was no significant difference of ultimate tensile strength (UTS) among the blends. For the same concentration of PLA (40%) in PLA-PBAT mixture, PLAF exhibited higher values of E and UTS than that of PLA/PBAT blends. Elongation of PLA/PBAT blends rapidly decreased upon the addition of PLA to the blends. The values of E and UTS for PLA/PBAT blends and composite, neat PLA, and PP increased with the decreasing of temperature from room temperature to -18°C. The effect of decreasing temperature was not observed on elongation. It was appeared from the results obtained for FTIR and DSC measurements that PLA and PBAT were immiscible, separating into two phases.

scholarly journals Preparation and Properties of Wet-Spun Microcomposite Filaments from Various CNFs and Alginate

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1709
Author(s):  
Ji-Soo Park ◽  
Chan-Woo Park ◽  
Song-Yi Han ◽  
Eun-Ah Lee ◽  
Azelia Wulan Cindradewi ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Tensile Properties ◽  
Cellulose Nanofibrils ◽  
Deep Eutectic Solvent ◽  
Microfluidic Channel ◽  
Cellulose Nanofibril ◽  
Pure Cellulose ◽  
Alginate Fibers ◽  
Cacl2 Solution

We aimed to improve the mechanical properties of alginate fibers by reinforcing with various cellulose nanofibrils (CNFs). Pure cellulose nanofibril (PCNF), lignocellulose nanofibril (LCNF) obtained via deep eutectic solvent (DES) pretreatment, and TEMPO-oxidized lignocellulose nanofibril (TOLCNF) were employed. Sodium alginate (AL) was mixed with PCNF, LCNF, and TOLCNF with a CNF content of 5–30%. To fabricate microcomposite filaments, the suspensions were wet-spun in calcium chloride (CaCl2) solution through a microfluidic channel. Average diameters of the microcomposite filaments were in the range of 40.2–73.7 μm, which increased with increasing CNF content and spinning rate. The tensile strength and elastic modulus improved as the CNF content increased to 10%, but the addition of 30% CNF deteriorated the tensile properties. The tensile strength and elastic modulus were in the order of LCNF/AL > PCNF/AL > TOLCNF/AL > AL. An increase in the spinning rate improved the tensile properties.

scholarly journals Improving Tensile Properties of Polylactic Acid Parts by Adjusting Printing Parameters of Open Source 3D Printers

2019 ◽  
Vol 26 (1) ◽  
pp. 83-87 ◽  
Author(s):  
Yubo TAO ◽  
Peng LI ◽  
Ling PAN
Keyword(s):  
Tensile Strength ◽  
Elastic Modulus ◽  
Open Source ◽  
Tensile Properties ◽  
Polylactic Acid ◽  
Elongation At Break ◽  
Layer Height ◽  
Fused Deposition ◽  
3D Printers ◽  
Printing Parameters

Open source 3D printers (OS3DPs) have become increasingly more widespread in recent years because of their ease of use and budget friendliness, with the majority being fused deposition modeling (FDM) printers. However, due to natural deficiencies of the FDM printing methodology, different printing parameters can cause various properties of printed parts. To obtain printed polylactic acid (PLA) parts with improved tensile properties, a tension model of the part and an orthogonal experiment scheme were constructed in this paper. The effects of three printing parameters (layer height, orientation angle (OA) of the part, and print speed) on tensile properties (elastic modulus, tensile strength, and elongation at break) were investigated. The results demonstrated that the printing parameters affected the tensile properties of PLA parts. Larger layer height and lower print speed contributed to the improvement of tensile strength. The OA of the part had the greatest effect on the parts’ elastic modulus and elongation at break among the three parameters. Both layer height and OA of the part affected part tensile strength significantly. In this research, layer height of 0.2 mm and print speed of 20 ~ 30 mm/s are found to be the optimal printing parameters. Adjusting the OA of the part can provide targeted tensile properties, and the parts with the OA of 45° resulted in the lowest tensile strength because the tensile force is only held by fibers parallel to the force orientation instead of all fibers.

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