216 The Effect of Heat Exposure on the Mechanical Properties of Sintered Mg_2Si

2015 ◽  
Vol 2015.23 (0) ◽  
pp. _216-1_-_216-5_
Author(s):  
Shuhei HASEGAWA ◽  
Takashi NAKAMURA ◽  
Ryo INOUE ◽  
Tsutomu IIDA ◽  
Yasuo KOGO
Keyword(s):  
Mechanical Properties ◽  
Heat Exposure

Experimental Investigation of Post-Fire Mechanical Properties of Q345R Steel

2015 ◽  
Author(s):  
Shanshan Shao ◽  
Guodong Jia ◽  
Luowei Cao ◽  
Chenyang Du
Keyword(s):  
Mechanical Properties ◽  
Heat Exposure ◽  
Tensile Tests ◽  
Pressure Vessels ◽  
Metallographic Analysis ◽  
Fire Exposure ◽  
Hardness Testing ◽  
Fire Event ◽  
Metallographic Examination ◽  
Different Temperatures

The degeneration of mechanical properties is one of the main concerns in assessment of fire damaged pressure vessels. This study investigates the influence of fire exposure on mechanical properties of Q345R steel which is widely used for pressure vessels in China. Heat treatment with different temperatures and holding times was conducted to simulate various heat exposure conditions in fire event. Hardness testing, metallographic analysis and tensile tests were carried out to investigate the effects of fire exposure temperature and duration. The experimental results indicate that the inflection temperature for mechanical property degeneration of Q345R steel is 700 °C. The decline of hardness, yield and tensile strengths due to spheroidization become more obvious with increasing heat exposure duration. A linear correlation is indicated by fitting the tensile strength and hardness. For the assessment of fire damaged component, the mechanical properties of Q345R steel at room temperature can be determined combining on-situ field metallographic examination and hardness testing with.

Joining of Zirconia Reinforced Metal-Matrix Composites

2015 ◽  
Vol 825-826 ◽  
pp. 498-505 ◽  
Author(s):  
Christian Weigelt ◽  
Harry Berek ◽  
Christos G. Aneziris ◽  
Ralf Eckner ◽  
Lutz Krüger
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Composite Structures ◽  
Room Temperature ◽  
Heat Exposure ◽  
Base Materials ◽  
Metastable Austenitic Stainless Steel

Metal-matrix composite materials, based on a metastable austenitic stainless steel reinforced with a magnesia partially stabilised zirconia have been prepared by a ceramics-derived extrusion technology. Using this powder metallurgical method enables the shaping of lightweight cellular structures as well as bulk specimens with a variety of steel/ceramic ratios at room temperature. However, the extrusion of composite structures is limited by the uniform cross section throughout its entire length. Joining of these metal-matrix composite preforms after sintering by conventional welding techniques is a challenging task. The presence of ceramic fractions may lead to several complications and the subsequent heat exposure during joining may initiate phase transformations in both metastable components resulting in a deterioration of the mechanical properties of the composite material. An adapted ceramics-derived joining technology allows the combination of varying TRIP-steel/zirconia composite materials. The main features are the machining and joining of the parts in their dry green state at room temperature before their thermal treatment. Thus, the material’s consolidation and the formation of the joint take place simultaneously. The ability of joining different parts offers the possibility to create structures for complex applications and testing conditions. The key to advanced properties of the joining zone are the base materials, the surface treatment of the parts, and the paste used for joining. The joining process of different base materials, the mechanical properties, and the microstructure of sinter-joint samples are presented.

Test Matrix for Heat Exposure of Aluminum Alloys at Various Times and Temperatures

2014 ◽  
Vol 354 ◽  
pp. 175-181
Author(s):  
Abdulhamid Al-Abduljabbar ◽  
O.S. Es-Said
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Aluminum Alloys ◽  
General Relation ◽  
Heat Exposure ◽  
Thermal Exposure ◽  
Static Mechanical ◽  
Hardness Values ◽  
Static Mechanical Properties

The purpose of this study is to characterize the effects of heat damage on the electrical conductivity and static mechanical properties of aluminum alloys. The data resulting from the experiments of thermal exposure of several aluminum alloys are used to model the relations that describe the dependence of the electrical conductivity and hardness on the two main variables of these experiments: the temperature and the time of exposure. The dependence of yield strength and ultimate tensile strength on hardness values is characterized. For each case, different materials (alloys) exhibit similar general trends although there are different coefficients for each material to satisfy the general relation.

scholarly journals Effect of radiant heat exposure on structure and mechanical properties of thermal protective fabrics

Polymer ◽  
2021 ◽  
pp. 123634
Author(s):  
Anjani K. Maurya ◽  
Sumit Mandal ◽  
Dean E. Wheeldon ◽  
Jean Schoeller ◽  
Michel Schmid ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Exposure ◽  
Radiant Heat ◽  
Protective Fabrics

scholarly journals Effects of pre-mature harvest and heat exposure on physical and mechanical properties of Pandanus tectorius leaves

2017 ◽  
Author(s):  
John A Toman
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Heat Exposure ◽  
Physical And Mechanical Properties ◽  
Maximum Growth ◽  
Mechanical Efficiency ◽  
French Polynesia ◽  
Plant Materials ◽  
Wide Range ◽  
Pandanus Tectorius

Plant materials have long been utilized for human use because of their wide range of physical properties and incredible mechanical efficiency as eco-friendly structures. One example of their use today is the practice of using the sturdy leaves of Pandanus tectorius for thatching purposes. An increase in modern demand for P. tectorius is pressuring farmers to deviate from traditional harvesting methods in an attempt to increase leaf yield. With little knowledge of the repercussions of their new practice, modern farmers are pre-maturely harvesting leaves through heat-induced leaf drying while the leaves remain on the tree. In this study, life-history characteristics, physical and mechanical properties of P. tectorius leaves on Mo’orea, French Polynesia are examined to determine whether or not this deviation from traditional harvest methods reduces leaf efficacy as a thatching material. Quantitative measures of P. tectorius leaves suggest that pre-mature harvest does not alter the size of collected leaves for thatch because most leaves on a tree have already reached maximum growth. Heat-induced leaf drying, however, reduces the tensile strength of P. tectorius leaves by about 25%. Further research may find that this loss in leaf tensile strength may correlate to less robust roofing structures, hindered longevity and ultimately an increase in energy cost to repair and rebuild such structures.

FFS Assessment for Material Degradion due to Fire Damage of Pressure Equipment

2013 ◽  
Author(s):  
Tsutomu Kikuchi ◽  
Tomoyuki Kurihara ◽  
Toru Nishikawa ◽  
Tomoyuki Fujishiro ◽  
Satoshi Nagata ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Heat Exposure ◽  
Evaluation Criteria ◽  
Fire Damage ◽  
Material Degradation ◽  
Elapsed Time ◽  
Metallurgical Analysis ◽  
Damaged Materials

The fire damage FFS assessment is based on the material degradation associated with heat exposure. The proposed identification of heat exposure zone will be provided in the API 579-1/ASME FFS-1 Standard. As the useful judgments, temper colors and mechanical properties such as tensile strength, hardness, impact energy, ductility and so on for the damaged materials. However, the reference temper colors are shown only by the names of colors without photographic examples and the details of metallurgical analysis are not available in the Standard. This paper presents the temper color reference shows by presenting several photographic examples of different exposed temperature, elapsed time and cooling rates for carbon steel and stainless steel. The metallurgical analysis guide describes typical degradations in mechanical properties and appearances in microstructure observed in the materials exposed to fire, evaluation criteria, procedure for replica preparation, personnel qualification and so on.

Effect of Interfacial Reaction in Sn-Ag-Cu Solder Alloy with Ni Addition

2011 ◽  
Vol 462-463 ◽  
pp. 247-252 ◽  
Author(s):  
Hirohiko Watanabe ◽  
Masayoshi Shimoda ◽  
Noboru Hidaka ◽  
Ikuo Shohji
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compounds ◽  
Solder Alloy ◽  
Interfacial Reaction ◽  
Heat Exposure ◽  
Ni Addition ◽  
Exposure Conditions

Sn-Ag-Cu-Ni-Ge solder alloy has been developed to improve the mechanical properties of the Sn-Ag-Cu base solders and prevent oxidation of those solders. In this paper, an interfacial reaction and microstructure between the solder and a Cu electrode were investigated under heat exposure conditions. It was found that intermetallic compounds growth at the interface of the solder and the Cu electrode was greatly affected by amounts of added elements. Adding Ni in the solder can suppress the formation and growth of intermetallic compounds (IMCs) such as Cu-Sn and decreasing the amount of adding Ag in the solder can prevent the formation and growth of Ag3Sn. Moreover, it was found that there was an effect of suppress the growth of the Cu3Sn formed on the interface of Cu and (Cu,Ni)6Sn5 by adding Ni from analysis results of EDX and TEM.

scholarly journals Thermal Aging of Unsaturated Polyester Composite Reinforced with E-Glass Nonwoven Mat

2017 ◽  
Vol 17 (4) ◽  
pp. 313-318 ◽  
Author(s):  
Milon Hossain ◽  
A.H.M Fazle Elahi ◽  
Shahida Afrin ◽  
Iqbal Mahmud ◽  
Haeng Muk Cho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Prolonged Exposure ◽  
Mechanical Test ◽  
Unsaturated Polyester ◽  
Heat Exposure ◽  
Polymeric Composite ◽  
Heat Treated Sample ◽  
Glass Fiber Reinforced ◽  
Polyester Composite

Abstract An experiment was carried out using glass fiber (GF) as reinforcing materials with unsaturated polyester matrix to fabricate composite by hand layup technique. Four layers of GF were impregnated by polyester resin and pressed under a load of 5 kg for 20 hours. The prepared composite samples were treated by prolonged exposure to heat for 1 hour at 60-150°C and compared with untreated GF-polyester composite. Different mechanical test of the fabricated composite were investigated. The experiment depicted significant improvement in the mechanical properties of the fabricated composite resulted from the heat treatment. The maximum tensile strength of 200.6 MPa is found for 90°C heat-treated sample. The mechanical properties of the composite do seem to be very affected negatively above 100°C. Water uptake of the composite was carried out and thermal stability of the composite was investigated by thermogravimetric analysis, and it was found that the composite is stable up to 600°C. Fourier transform infrared spectroscopy shows the characteristic bond in the composite. Finally, the excellent elevated heat resistant capacity of glass-fiber-reinforced polymeric composite shows the suitability of its application to heat exposure areas such as kitchen furniture materials, marine, and electric board.

Characterization of polyoxymethylene for backsheets of photovoltaic modules

2016 ◽  
Vol 33 (4) ◽  
pp. 345-360 ◽  
Author(s):  
Gernot M Wallner ◽  
Klaus J Geretschläger ◽  
Ingrid Hintersteiner ◽  
Wolfgang Buchberger
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Elastic Modulus ◽  
Heat Exposure ◽  
Potential Candidate ◽  
Photovoltaic Modules ◽  
Anisotropic Mechanical Properties ◽  
Pv Modules ◽  
Potential Use

This article describes and evaluates the basic properties and the damp heat (85%RH, 85℃) aging behaviour of a 400 µm thick titanium dioxide filled polyoxymethylene film for potential use as backsheet in photovoltaic (PV) modules. The polyoxymethylene monolayer was characterized using analytical methods and technological tests. The stabilizer package contained Tinuvin 234, Tinuvin 770 and Irganox 245. The less than 1 wt% pigmentation resulted in 0.680 solar optical reflectance. The slightly anisotropic mechanical properties elastic modulus and strength were within the requirements for backsheets. Damp heat exposure triggered degradation, stabilizer loss and lead to optical properties degrading (yellowing). However, neither premature embrittlement nor a critical loss of ultimate mechanical properties was found after 5005 h of aging. Hence, polyoxymethylene was classified as a potential candidate for backsheet core layers.

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