Effect of Manufacturing Process on Material Properties at the Corners of G450 Cold-Formed Steel Channel Sections

2017 ◽  
pp. 434-441 ◽  
Author(s):  
Huu Nam Trinh ◽  
Gwénaëlle Proust ◽  
Cao Hung Pham
Keyword(s):  
Material Properties ◽  
Manufacturing Process ◽  
Cold Formed Steel

scholarly journals Mechanical Properties of Steels for Cold-Formed Steel Structures at Elevated Temperatures

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Zhen Nie ◽  
Yuanqi Li ◽  
Yehua Wang
Keyword(s):  
Mechanical Properties ◽  
Material Properties ◽  
Elevated Temperatures ◽  
Elasticity Modulus ◽  
Mechanical Performance ◽  
Strain Curve ◽  
Steel Structures ◽  
Test Method ◽  
Stress Relieving ◽  
Cold Formed Steel

It is highly important to clarify the high-temperature mechanical properties in the design of cold-formed steel (CFS) structures under fire conditions due to the unique deterioration feature in material properties under fire environment and associated reduction to the mechanical performance of members. This paper presents the mechanical properties of widely used steels for cold-formed steel structures at elevated temperatures. The coupons were extracted from original coils of proposed full annealed steels (S350 and S420, with nominal yielding strengths 280 MPa and 350 MPa) and proposed stress relieving annealed steels (G500, with nominal yielding strength 500 MPa) for CFS structures with thickness of 1.0 mm and 1.2 mm, and a total of nearly 50 tensile tests were carried out by steady-state test method for temperatures ranging from 20 to 700°C. Based on the tests, material properties including the yield strengths, ultimate strengths, the elasticity modulus, and the stress-strain curve were obtained. Meanwhile, the ductility of steels for CFS structures was discussed. Then, the temperature-dependent retention factors of yield strengths and elasticity modulus were compared to those provided by design codes and former researchers. Finally, a set of prediction equations of the mechanical properties for steels for CFS structures at elevated temperatures was proposed depending on existing tests data.

Microstructure Characteristics of YBa2Cu3O7-y Nanocomposite by Shortening the Manufacturing Process

2020 ◽  
Vol 20 (11) ◽  
pp. 6703-6705
Author(s):  
Sang Heon Lee
Keyword(s):  
Surface Area ◽  
Material Properties ◽  
Manufacturing Process ◽  
Boundary Surface ◽  
Important Goal ◽  
Ybco Bulk ◽  
Microstructure Characteristics ◽  
Large Particles

In this study, YBCO bulk was produced using two seeds by placing an additional seed on the upper pellet of the sample fabricated with the ISMG process. It was confirmed that the upper and lower pellets consisting of a–b sector showed a higher number of Y211 particles than those consisting of a–c sector, and that the same tendency appeared at a spot where different interfaces existed. This can be most clearly compared at the center. Finally, it was found that although minimizing the growth of a–c sector is an important goal for fabricating superconducting bulk magnets with high material properties, it is necessary to minimize the size of areas where different interfaces appear. It can be seen that the number of Y211 particles is the smallest inside the boundary surface, and that although they occupied a relatively smaller surface area, large particles agglomerated together.

Assessment of Mechanical Properties of Cold Formed Steel Material at Elevated Temperature

2016 ◽  
Vol 846 ◽  
pp. 27-36
Author(s):  
Fadhluhartini Muftah ◽  
Mohd Syahrul Hisyam Mohd Sani ◽  
Ahmad Rasidi Osman ◽  
Mohd Azran Razlan ◽  
Shahrin Mohammad
Keyword(s):  
Elastic Modulus ◽  
Elevated Temperature ◽  
Ambient Temperature ◽  
Yield Stress ◽  
Material Properties ◽  
High Efficiency ◽  
Strain Curve ◽  
Ultimate Stress ◽  
Fire Incident ◽  
Cold Formed Steel

Fire accident is considered as the one of most severe environmental hazards to building and infrastructure. Cold formed steel (CFS) beam has been used extensively as primary load bearing structural member in many applications in the building construction due to high efficiency in term of production, fabrication, and assembling in construction. This material must be well perform in fire incident in term of its integrity and stability of structural for a period of time. Hence, the assessment of the material properties of this material is greatly important in order to predict the performance of this structure under fire incident. The tensile coupon tests of CFS are according to BS EN 10002-1:2001. The CFS material G450 with 1.9 mm thickness is used in this study. The elastic modulus, yield stress, correspondent percentage strain at yield stress, ultimate stress, and correspondent percentage strain of ultimate stress was 200.3 GPa, 540.5 MPa, 0.478 %, 618.8 MPa, and 8.701 % respectively. The results of the ambient temperature test have been used to assess the mechanical strength of CFS at elevated temperature. The discussion of material properties is based on EC3-1-2 and proposed model from other researchers. The main material properties discussed is the stress-strain curve, elastic modulus, yield strength at elevated temperature was determined. The actual elastic region is slightly lower than the prediction of EC3-1.2 at ambient temperature, but well fit with two other studies. Besides that, the actual material properties experience strain hardening after yielding and reach a maximum stress up to 618 MPa while EC3-1.2 predict the constant value of the yield stress after yield until 15 % strain,other two study was fit the ambient tensile test up to ultimate stress, and fit until 2 % strain level.

Experimental investigation of the curing behaviour of fibre composite structures with snap-cure polymer systems

2018 ◽  
Vol 9 (6) ◽  
pp. 768-778
Author(s):  
Rafal Stanik ◽  
Albert Langkamp ◽  
Michael Müller ◽  
Maik Gude ◽  
Anna Boczkowska
Keyword(s):  
Experimental Investigation ◽  
Temperature Field ◽  
Process Parameters ◽  
Material Properties ◽  
Manufacturing Process ◽  
Composite Structures ◽  
Fibre Composite ◽  
Uniform Design ◽  
Curing Process ◽  
Content Type

PurposeNovel snap-cure polymers (SCPs), as matrix systems for high-performance fibre composite materials, provide high potential for manufacturing of component families with small batch sizes and high variability. Especially, the processing of powdered SCP is associated with relatively simple and inexpensive tools. In addition, because of their curing behaviour, they allow short tooling times so that the production of small batch size components is possible in relatively short cycle times. To enable an efficient manufacturing process, an understanding of the curing process is necessary. An adjustment of the process parameters for a uniform design of the temperature field in the material during the manufacturing process is essential. The paper aims to discuss this issue.Design/methodology/approachFor this, a powder SCP resin system was investigated under process-specific conditions. An experimental test approach for determination of various thermal and kinetic material properties was developed. For the adjustment of the process parameters and monitoring of the curing state during the manufacturing process, a kinetic material model was determined. In the end, the validation of the determined model was performed. For this, the temperature distribution under process- specific conditions was measured in order to monitor the curing state of the material.FindingsThe experimental investigation showed an uneven temperature field in the material, which leads to an inhomogeneous curing process. This can lead to residual stresses in the structure, which have a critical impact on the material properties.Originality/valueThe determined kinetic model allows a prediction of the curing reaction and adjustment of the process parameters which is essential, especially for thick-walled components with SCPs.

Improvement of the Mechanical Properties of Formed Steel Cross Section Profile for Timber Upgrading

2012 ◽  
Vol 498 ◽  
pp. 139-144
Author(s):  
C. González-Bravo ◽  
J. Claver ◽  
R. Álvarez ◽  
Rosario Domingo
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Cross Section ◽  
Manufacturing Process ◽  
Mechanical Characteristics ◽  
Section Profile ◽  
Cold Formed Steel ◽  
Deform 2D ◽  
Cross Section Profile

The main objective of this paper is to analyze the behaviour of cold formed steel cross section respect to mechanical characteristics, such as deflection, mainly. A cold formed steel profile with thickness of 1 mm regards is studied to determine its viability as reinforcement of timber upgrading. Thus, temperatures, stresses and strains have been analysed during the manufacturing process of these profiles, and also, the deflection supported, comparing between unreinforced and reinforce pieces. The analysis has been carried out by means of Finite Element Method, using DEFORM 2D software, during the simulation of manufacturing process and COPRA software during the final static computations. Results provide information about the integrity and good behavior of these profiles for timber upgrading.

scholarly journals Manufacturing Process beyond Conventional Plasticity Theory: Case Study in Manufacturing Low Spring Index Coil

2020 ◽  
Vol 1 (2) ◽  
pp. 98-104
Author(s):  
Yunan Prawoto ◽  
Sonia Manville ◽  
T Sakai ◽  
M Tanaka ◽  
T Gnauple-Herold
Keyword(s):  
Residual Stress ◽  
Fracture Mechanics ◽  
Material Properties ◽  
Manufacturing Process ◽  
Annealing Process ◽  
Plasticity Theory ◽  
Coil Spring ◽  
Academic World

In the academic world, conventional plasticity theory limits the cold process due to energy inefficiency, material properties and residual stress that may inhibit the quality of a product, and therefore usually not recommended. However, industrial competition pushes that limits against the edge. Knowing the consequences in advance helps reducing the damage that may have been caused by such a violation. This paper shows an example in the form of a case study. A coil spring with a very low spring index that academically suggested to be made using hot process was attempted to be manufactured using cold coiling machine. The case study shows that although it is possible, extra careful and timely handling must be done to successfully manufacture it. A coil with excessive residual stress is shown in this paper. That residual stress alone was capable in damaging the coil during manufacturing. The defect takes place after coiling and before tempering process. A fracture mechanics was used to analyze the failure, which is the splitting due to excessive residual stress. The case study also shows that the problem can be solved by speedy and subsequent stress relieve annealing process.

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