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Strength of Materials Lab |
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| | Post date: 2020/05/31 | |
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Introduction to Strength of Materials Laboratory
The Strength of Materials laboratory is located inside the Auto-mechanic Workshop complex of the School of Mechanical Engineering. In this laboratory, students experimentally investigate the concepts taught in the courses Strength of Material I and II, and examine the accuracy of existing theories via experiments. Benefiting from a rich variety of equipment, the Strength of Materials lab facilitates deep understanding of Solid Mechanics concepts.
Notices
- Virtual classes during the COVID outbreak: Download the notice from here.
Lab Instructions
Download the lab instructions in PDF from here [in Persian only]. 
(Updated in: 02/08/2021)
Experiments Schedule During the Semester
Download the schedule in PDF from here.
Report Preparation and Grading
The procedure of report preparation and grading by lecturers can be downloaded in PDF from here [in Persian only].
E-Learning
The content of virtual learning for the Strength of Materials lab can be downloaded from the table below (*):
| Experiment Name |
Learning Material(s) |
| Introduction |
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| 1. Elasticity modulus |
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| 2. Poisson's ratio |
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| 3. Principal stresses and strains |
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| 4. Stress and strain concentration |
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| 5. Bending of cantilevered beam |
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| 7. Tension of metals with universal machine |
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| 8. Compression of spiral and flat springs |
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| 9. Torsion of shafts |
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| 10. Bending of simply supported beam |
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| 11. Unsymmetric loading |
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| 12. Shear center |
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| 13. Measuring stresses and strains in thick-walled cylinders |
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| 14. Parabolic beam |
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| 15. Fatigue |
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| 16. Buckling |
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(*) Video files have audio in Persian only.
(**) With regard to the end of support of "flash files" by Adobe since the beginning of 2021, employ one of the following methods to open such files:
1. Use Adobe Animate CC
2. Set back your PC date to before 2021, then use Internet Explorer (IE)
Investigated Experiments
Here is the list of experiments investigated in the Strength of Materials lab:
Experiment name: Elasticity modulus, Poisson's ratio, principal stresses and strains, stress and strain concentration, bending of cantilevered beam
Equipment made in: Iran
Data-logger precision: 2 με
Brief explanation on experiment: In all these experiments, deformations in a cantilevered aluminium beam with concentrated load at free end is investigated using strain gauge(s).
Equipment status: Active |
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Experiment name: Compression of spiral and flat springs using universal testing machine
Equipment made in: TecQuipment, England
Loading Capacity: 23 tones
Displacement stroke: 36 centimeter
Brief explanation on experiment: Measuring both force and displacement, one can determine the spring stiffness in this experiment.
Equipment status: Active |
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Experiment name: Torsion of shafts, bending of simply supported beam
Equipment made in: Terco, Sweden
Brief explanation on experiment: In the torsion experiment, three circular bars made of steel, aluminium and brass are subjected to specific torque and their angle of rotation is measured. The aim is to find the shear modulus.
In the bending experiment, steel beams of different dimensions are employed to analyze the effect of loading span, thickness and width of the beam on the maximum deflection of the beam.
Equipment status: Active |
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Experiment name: Unsymmetric loading, shear center
Equipment made in: TecQuipment, England
Brief explanation on experiment: In the unsymmetric loading experiment, the influence of load exertion, in a plane different than the symmetry plane of an L-shaped beam is investigated, and the effect on bending and twisting of the beam is quantified.
In the other test, the shear center for a C-shaped beam is located experimentally.
Equipment status: Active |
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Experiment name: Measuring stresses and strains in thick-walled cylinders
Equipment made in: Santam, Iran
Data-logger precision: 0.0001 με
Brief explanation on experiment: In this experiment, a thick-walled cylinder (with 5.5 cm-thick wall) is pressurized by a fluid (silicone oil) from inside. Oil pressure is adjusted on 200, 300 and 400 psi, and the strain values (measured by totally 13 strain gauges) are read. Thereafter, the stress values can be obtained by the Hooke's 3D law.
Equipment status: Active |
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Experiment name: Parabolic beam
Equipment made in: TecQuipment, England
Brief explanation on experiment: This experiment assesses the slope and deflection of a parabolic-shaped beam. Utilizing the built-in loading bars and weights, concentrated forces (in symmetric and unsymmetric fashion) are exerted to the beam, whose deflection and slope are measured using two dial gauges.
Equipment status: Active |
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Experiment name: Fatigue
Equipment made in: Terco, Sweden
Nominal motor speed: 3000 rpm
Brief explanation on experiment: This experiment help characterize the bending-rotational fatigue behaviour of steel specimens. Subjected to tension/compression oscillatory load at the free end, the specimen fractures after a number of thousand cycles, the exact figure of which being recorded by a tachometer.
Equipment status: Active |
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Experiment name: Buckling
Equipment made in: Santam, Iran
Brief explanation on experiment: This experiment determines the critical load that leads to column buckling. Specimens made of steel and brass in different dimensions are tested, and the influence of these factors on the critical buckling load is scrutinized. The impact of supports (simply supported at both ends, clamped at both ends, one end clamped and one simply supported) on the critical load is evaluated.
Equipment status: Active |
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Contact Us
Address: Strength of Materials Lab, Auto-mechanic Workshop, Iran University of Science and Technology, Resalat Sq., Tehran, Iran.
Lab director: Dr. Mohammad Javad Ashrafi Phone: +98 21 7322 89 60
Lab superintendent: M.Eng. Saeid Ghouli
« Webpage design and content creation: M.Eng. Saeid Ghouli »
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