Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Tensile test

Mechanical Properties of Martensitic Stainless Steel (AISI420) Subjected to Conventional and Cryogenic Treatments

Hareer S. Mohamed; Ali H. Ataiwi; Jamal J. Dawood

Engineering and Technology Journal, 2020, Volume 38, Issue 8, Pages 1096-1105
DOI: 10.30684/etj.v38i8A.517

Martensitic Stainless Steel (AISI420) MSS are vastly used because of their properties conventional which mix good mechanical and corrosion resistance. Cryogenic up to -196°C for different soaking time and heat treatments at (1000,500,200°C) for 15 minutes is one of the ways that used to enhance mechanical properties of these steels by means transformation of retained austenite, deformation regarding martensite then carbide refinement. the result showed an increase in tensile strength of samples that were treated cryogenically and tempered at 500°C was 933 (MPa) compared to samples that just treated conventionally in austenitizing and tempering at the same temperature that was 880 (MPa). The hardness values increased considerably to 414HV and 321 HV for the specimen that tempered at 200°C and 500°C respectively, precipitation of small carbides was observed that this is responsible for the improvement in the mechanical properties of the material.

Tensile and Buckling of Prosthetic Pylon made from Hybrid Composite Materials

Jawad Kadhim Oleiwi; Shaymaa Jumaah Ahmed

Engineering and Technology Journal, 2016, Volume 34, Issue 14, Pages 2642-2653

Compared to traditional prosthetic pylon materials (Aluminum, Titanium, or Stainless steel.), composite prosthetic pylon materials are used instead of metals. Vacuum bagging technique was adopted for the preparation of specimens made of Poly methyl methacrylate (PMMA) as matrix with constant Perlon layers and different number of Hybrid (Carbon + Glass) fibers layers as reinforcement materials at (±45º&0º/90º) orientation relative to applied load. Also the finite element method (ANSYS-15) were used by create a model of prosthetic pylon and applied compressive load at heel strike step from gait cycle to known the critical buckling stress. The experimental and numerical results shown that the tensile strength, modulus of elasticity, and critical buckling stress increases with increasing number of Hybrid fibers layers, that equal to (145 MPa, 6.25 GPa, and 670 MPa) respectively, and the percentage of increase in tensile strength, modulus of elasticity, and critical buckling stress for specimen with three Hybrid (Carbon + Glass) layers and Perlon layers in PMMA resin compared with pure PMMA specimen was (302.7% , 300% & 257.22%) respectively, at (0º/90º) fibers orientation relative to tensile force.

Mechanical Properties For Pipes Made From Composite Materials (Glass/ Epoxy And Carbon/ Epoxy) Subjected To Internal Pressure

Zainab K. Hantoosh; Hatam Kareem Kadhom; Aseel Jasim Mohammed

Engineering and Technology Journal, 2012, Volume 30, Issue 6, Pages 117-134

Composite Materials have been used extensively in application such as pipes and pressure vessels. Therefore it is important for further studies on the properties of these materials. This paper presents the results from a series of tensile tests on the mechanical properties of composite materials. Specimens cut from pipes made from composite materials were tested under internal pressure loadings have been tested by using a series of ASTM Standards test methods for mechanical properties. Based on the results obtained, the longitudinal E11,
transverse E22 and shear modulus G12 of 101.2 GPa, 5.718 GPa, 4.346 GPa and 36.6, 5.4 GPa, 4.085 GPa for carbon and glass fiber/ epoxy composites, respectively, while the ultimate longitudinal XL, transverse XT and shear tensile τ0 strengths of 1475.4 MPa, 20 MPa, 36 MPa and 618.9 MPa, 14 MPa, 28 MPa for carbon and glass fiber/epoxy composites, respectively. The results from this series of tests have been presented and compared with results from analytical equations. Good agreement was achieved between the experimental results and
analytical results.

Study of tensile strength and compression strength of binary polymeric blends (High Density poly ethylene /polycarbonate)

Sanaa A. Hafad; Balkees M. dyaa; Mohammed S. Waheed

Engineering and Technology Journal, 2008, Volume 26, Issue 7, Pages 812-823

In this work, HDPE/PC binary polymeric blends has been made by using the single
screw extruder machine .
The tensile strength measurements showed that this blend have higher
results reflects the homogeneity of the mixture and higher strength
compared with that of single material the strength like HDPE or PC alone
and these values increase when blending with ratio (80/20) of (HDPE/PC);
and increase more when reinforcing with E-glass fibers (1%). Also in the
compressive strength increases for blends of (80/20%) (HDPE/PC)
furthermore, a composite of these blends with E-glass fiber these values
are increased more .