Superplastic Forming

2019 ◽  
Author(s):  
Norman Ridley
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Process Development ◽  
Superplastic Forming ◽  
Stretch Forming ◽  
Uniform Deformation ◽  
Forming Simulation ◽  
Structural Applications ◽  
Identification And Characterization

An inherent limitation of conventional aluminum alloys is that they are unstable when plastically deformed by stretching which leads to catastrophic necking when tensile testing and limitations on uniform deformation during stretch forming under tensile stress. This has led to the development of superplastic forming (SPF) process development used for the production of products for structural and non-structural applications in industries such as aerospace, automotive, architecture, transport and others. This article provides a general overview of superplastic forming and addresses: identification and characterization of superplastic alloys, processing of superplastic alloys, cavitation and failure, superplastic forming, simulation, and applications and mechanical properties.

PREPARATION, MORPHOLOGY AND MECHANICAL PROPERTIES OF EPOXY NANOCOMPOSITES WITH ALUMINA FILLERS

2010 ◽  
Vol 24 (01n02) ◽  
pp. 136-147 ◽  
Author(s):  
SHEAU HOOI LIM ◽  
KAIYANG ZENG ◽  
CHAOBIN HE
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Thermomechanical Properties ◽  
Nano Particles ◽  
Testing Methods ◽  
Transmission Electron ◽  
Alumina Particles ◽  
Thermomechanical Testing ◽  
Platelet Shape

This paper presents recent studies on the processing and characterization of epoxy-alumina nanocomposites. Nano-sized alumina particles are incorporated into epoxy resin via solvent-assisted method, so that the particles are dispersed homogeneously in the epoxy matrix. The morphologies, mechanical and thermomechanical properties of the resulting nanocomposites are studied using transmission electron microscope (TEM), conventional tensile testing and thermomechanical testing methods. TEM results show that the alumina nano-particles with a higher specific surface area tend to agglomerate. Furthermore platelet shape particles shows a better dispersion homogeneity as well as better improvement in the mechanical properties of the composites compared to the rod shape particles.

Mechanical Characterization of Polymer Nanowires Using MEMS

2006 ◽  
Author(s):  
B. A. Samuel ◽  
Bo Yi ◽  
R. Rajagopalan ◽  
H. C. Foley ◽  
M. A. Haque
Keyword(s):  
Mechanical Properties ◽  
Tensile Testing ◽  
Furfuryl Alcohol ◽  
Mechanical Characterization ◽  
Uniaxial Tensile ◽  
Testing Device ◽  
Uniaxial Tensile Testing ◽  
Polymer Nanowires

We present results on the mechanical properties of single freestanding poly-furfuryl alcohol (PFA) nanowires (aspect ratio > 50, diameters 100–300 nm) from experiments conducted using a MEMS-based uniaxial tensile testing device in-situ inside the SEM. The specimens tested were pyrolyzed PFA nanowires (pyrolyzed at 800° C).

Quantitative Analysis of Instability for Superplastic Tension

2014 ◽  
Vol 941-944 ◽  
pp. 1505-1508
Author(s):  
Zhi Ping Guan ◽  
Ming Wen Ren ◽  
Pin Kui Ma ◽  
Po Zhao
Keyword(s):  
Strain Rate ◽  
Strain Path ◽  
Superplastic Forming ◽  
Uniform Strain ◽  
Deformation Condition ◽  
Al Alloy ◽  
Uniform Deformation ◽  
Rate Dependent ◽  
Strain And Strain Rate

In conventional analysis of instability, a rough prediction of uniform deformation was obtained due to taking material parameters as constants. In this study, the constitutive equation with varying parameters for Zn-5%Al alloy at 340 °C is employed to predict the critical values of uniform strain in tension based on Considere criterion and Hart criterion, respectively. It should address the factor of strain rate in the characterization of the capability of uniform deformation on superplastic alloys, or for that matter, on any rate-dependent material. Comparison and analysis indicated that the results on Hart criterion have the better predictability of uniform deformation than Considere criterion. The Considere criterion is dependent on strain path, while Hart crtierion is merely dependent on the values of strain and strain rate in tension, and is independent on the strain path or the deformation condition or the deformation history. Therefore, the uniform strain vs. strain rate relation can be taken as a quantitative reference for designing a reasonable strain path during superplastic forming with increase of formability and reduction of forming time.

Characterization of Microstructural Susceptibility by Color Tint Etching in a Friction Stir Welded Trip-780 Steel

2014 ◽  
Vol 1616 ◽  
Author(s):  
G.Y. Perez-Medina ◽  
P. Zambrano ◽  
F.A. Reyes-Valdés ◽  
H.F. López
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Testing ◽  
Shear Fracture ◽  
Friction Stir ◽  
Fine Grain ◽  
Lap Shear ◽  
Tool Pin ◽  
Tension Strength

ABSTRACTThe effect of friction stir welding (FSW) on the resultant microstructures in the welded nugget (WN), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base metal (BM) of a TRIP-780 steel was investigated in this work. Color tint etching was used in the welded regions to disclose the exhibited microstructural constituents. In addition, significant fine grain size material was found in the WN regions. It was found that is considered to have experienced severe plastic deformation due to interaction with the welding tool pin lead to a drop in mechanical properties. Lap shear tensile testing indicated that the steel shear tension strength in the welded condition dropped compared with the BM. Microhardness profiles of the welded regions indicated that the hardness in both the WN and TMAZ were relatively elevated suggesting the development of martensite in these regions. In particular, the WN was found to shear fracture with uniformly distributed elongation shear dimples.

scholarly journals Industrial Symbiosis Implementation Potential—An Applied Assessment Tool for Companies

2021 ◽  
Vol 13 (3) ◽  
pp. 1420
Author(s):  
João Azevedo ◽  
Inês Ferreira ◽  
Rui Dias ◽  
Cristina Ascenço ◽  
Bruno Magalhães ◽  
...  
Keyword(s):  
Swot Analysis ◽  
Assessment Tool ◽  
Process Development ◽  
Industrial Symbiosis ◽  
Current State ◽  
Process Implementation ◽  
Decision Making Processes ◽  
Quantitative Results ◽  
Identification And Characterization

A successful and broad implementation of industrial symbiosis (IS) initiatives is highly related to stakeholder’s involvement and technical considerations on its process’ development. This paper presents a mixed research study (quantitative and qualitative) focusing on the development of a dedicated tool based on sequential modules’ that support companies in the assessment of their potential to develop and implement IS scenarios. The first module considers the identification and characterization of the economic activity of the company to support an IS contextualization analysis. The second module provides the evaluation of the company’s current state, allowing key intervention areas to be defined. The third module focuses on the assessment of the potential scenarios for synergies implementation based on an economic benefit comparison of different valorization scenarios regarding the available surplus or waste. Complementarily, a SWOT analysis for the identification of the internal strengths and weaknesses, the external opportunities and threats associated with the IS process implementation is presented. The final output compiles qualitative and quantitative results regarding each module. The presented tool is currently under validation at industrial case studies. The preliminary results show the high applicability of the proposed tool in order to support decision making processes on surpluses valorization scenarios selection.

An approach for mechanical property optimization of fused deposition modeling with polylactic acid via design of experiments

2016 ◽  
Vol 22 (2) ◽  
pp. 387-404 ◽  
Author(s):  
Jonathan Torres ◽  
Matthew Cole ◽  
Allen Owji ◽  
Zachary DeMastry ◽  
Ali P. Gordon
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Fused Deposition Modeling ◽  
Mechanical Tests ◽  
Content Type ◽  
Fused Deposition ◽  
Structural Applications ◽  
3D Printers ◽  
Deposition Modeling

Purpose This paper aims to present the influences of several production variables on the mechanical properties of specimens manufactured using fused deposition modeling (FDM) with polylactic acid (PLA) as a media and relate the practical and experimental implications of these as related to stiffness, strength, ductility and generalized loading. Design/methodology/approach A two-factor-level Taguchi test matrix was defined to allow streamlined mechanical testing of several different fabrication settings using a reduced array of experiments. Specimens were manufactured and tested according to ASTM E8/D638 and E399/D5045 standards for tensile and fracture testing. After initial analysis of mechanical properties derived from mechanical tests, analysis of variance was used to infer optimized production variables for general use and for application/load-specific instances. Findings Production variables are determined to yield optimized mechanical properties under tensile and fracture-type loading as related to orientation of loading and fabrication. Practical implications The relation of production variables and their interactions and the manner in which they influence mechanical properties provide insight to the feasibility of using FDM for rapid manufacturing of components for experimental, commercial or consumer-level use. Originality/value This paper is the first report of research on the characterization of the mechanical properties of PLA coupons manufactured using FDM by the Taguchi method. The investigation is relevant both in commercial and consumer-level aspects, given both the currently increasing utilization of 3D printers for component production and the viability of PLA as a renewable, biocompatible material for use in structural applications.

Microstructural and Mechanical Characterization of Multipass Friction Stir Processed Al-Mg Alloy

2014 ◽  
Vol 902 ◽  
pp. 18-23
Author(s):  
S. Pradeep ◽  
Vivek Pancholi
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characterization ◽  
Rotation Speed ◽  
Bulk Material ◽  
Processing Condition ◽  
Superplastic Forming ◽  
Traverse Speed ◽  
Processing Conditions ◽  
Friction Stir

In the present investigation friction stir processing (FSP) is carried out using multipass FSP on a 5086 aluminum alloy to modify microstructure and mechanical properties. Two processing conditions P1 and P2 were used, P1 is carried out at constant rotation speed of 1025 rpm and at a traverse speed of 50 mm/min, P2 is carried out at constant rotation speed of 720 rpm and at a traverse speed of 155 mm/min. Inhomogeneous microstructural distribution was observed across the processed zone. EBSD analysis has been done to evaluate the microstructure. Overlapping passes is showing same grain size in the FSPed material. Material processed using P2 processing condition is showing maximum superplastic ductility. The bulk material produced due to multipass FSP seems to be good for superplastic forming applications.

Characterization of the Mechanical Properties of Spring Materials

1974 ◽  
Vol 96 (3) ◽  
pp. 839-844 ◽  
Author(s):  
G. F. Weissmann ◽  
B. C. Wonsiewicz
Keyword(s):  
Mechanical Properties ◽  
Quality Control ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Energy Dissipation ◽  
Yield Strength ◽  
Tensile Testing ◽  
Control Applications

Spring materials are purchased under specifications which impose limits on the tensile strength but do not control the crucial properties, i.e., resistance to plastic flow and stiffness. Present techniques for characterizing spring material are discussed in detail. A novel test is described which is quick, inexpensive, and reliable and holds promise for both research and quality control applications. The test is based on a dynamic determination of energy dissipation in a sample stressed in bending or torsion, the usual modes of deformation for most springs. Stiffness and permissible deformations are determined directly and the elastic modulus and yield strength can be calculated easily. The results obtained in this way compare favorably with those determined by tensile testing. An example is given which illustrates the operation of the test and the calculation of results. Since the entire test from sample preparation to calculation of results requires about five minutes, and since the apparatus should be relatively inexpensive, the test ought to find application in many areas where testing is not practical at the present time.

Mechanical and Fatigue Properties of Titanium Alloy SP 700 after Simulated Superplastic Forming Conditions

2012 ◽  
Vol 735 ◽  
pp. 372-382 ◽  
Author(s):  
Franna Pitt ◽  
Mamidala Ramulu
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Superplastic Forming ◽  
Fatigue Properties ◽  
Industry Standard ◽  
Structural Applications ◽  
Superplastic Properties

SP 700 is a relatively new titanium alloy with superplastic properties improved over the industry standard, Ti 6Al-4V. In order to use this alloy in structural applications following superplastic forming, the mechanical properties need to be well understood. This paper will present a summary of both static and fatigue properties of SP 700 following simulated SPF and post processed conditions, and compare them to Ti 6Al-4V

Preparation and Characterization of Polyesteramide Composited by Carbon Nanotube

2013 ◽  
Vol 562-565 ◽  
pp. 764-769
Author(s):  
Yi He ◽  
Lan Ma ◽  
Peng Hai ◽  
Jin Bo Li
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Carbon Nanotube ◽  
Tensile Testing ◽  
Elongation At Break ◽  
Multi Walled Carbon Nanotubes ◽  
In Suit ◽  
Walled Carbon Nanotubes

Polyesteramide (PEA) have good mechanical properties, compositing with multi-walled carbon nanotubes (MWNTs) can further improve the mechanical properties of the polymer. In this paper, PEA/MWNTs were synthesized in-suit using the reinforcement of nanocomposite. SEM and tensile testing were used to characterize the composited polyesteramides. The results show that MWNTs can be uniformly dispersed in the composited polyesteramides, the PEA/MWNTs tensile strength and Elongation at break increased.

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