Tensile Test Lab Report

A graph of the hardness of the material versus the percentage cold work was plotted for both specimens. In both cases, it was observed that the percentage of cold work increases proportionately with an increase in the hardness of the

This report will cover the two most used methods of experimental stress analysis; electronic resistance strain gauge and digital image correlation and their relevance in the aerospace industry. Background information, methods of preparation and operation and ways to obtain accurate results will be covered throughout the report.

The specimen ends were not thick or had moving wedge grips to keep it secure in the holders of the servo-hydraulic load frame. The movement of the specimen in the machine causes some of the data to be an inaccuracy. Also, the transverse strain causes issues with the strain gages that are called transverse sensitivity. The transverse sensitivity affects the accuracy of the data that is being collected for the transverse strain more than the longitudinal strain. This is greatly seen in the percent difference in the strain values such as in one case the Longitudinal strain was .4% while the transverse strain was 30%. Another issue with the strain gages was that if the strain gages weren’t properly placed on the specimen the data accuracy would

While calculating the results from the collected data, the thin plate shows non-linear behaviour such that stress does not vary linearly with strain. In theory when pressure is concentrated at the centre of a circular plate, stress value decreases with respect to increasing radial distance from the centre. However in this case, we see that there are two principal stresses and they behave differently than one another. This experiment will introduce us to a new strain gauge called strain gauge rosette used for multi-channel strain measurement and other equations to calculate principal stresses and strains in a two-dimensional state.

Each separate truss (of the dimensions 920x5x50mm) consisted of a Pratt truss with nine diagonal members on each side of the centre. The model was tested in sufficiently isolated condition by tutors. It successfully passed the initial weight test, and satisfactorily resisted horizontal forces. Once fitted onto the testing rig, loads were applied and increased incrementally. Slight deformation was observed before failing at 12.5 kg, at which force a collection of members failed in succession, concluding the test.

Several students are doing Science Fair projects at Woodstock Middle School and I am one of the seventh grade students. The topic I shall be doing is on how bridge structure affects the weight bearing capacity. I chose this specific topic to guide bridge builders in the right direction on what bridge is safest for public use. The key topics I plan to research on include the following: Beam, Warren Truss, suspension, cable-stayed, and arch bridges. I shall use the scientific method to guide me through this process.

This report aims to analyse and discuss the results of carrying out tensile tests for two materials, in this case Mild Steel and Nylon. The purpose of this is to use the information generated to calculate Young’s Modulus, Yield Stress, Tensile Strength, and Percentage Elongation. These properties must be known before designing a product using the materials tested, because the anticipated behaviour of the material must be suitable for the design specification, with a margin left for safety.

Compression is the last thing going on here in this experiment. Compression is thrust, load, stress, compressing, squeezing, crushing, weight, and heaviness. Take the paper again and after you’ve used tension with it let's use compression. If you crush the paper into a ball. This is compression. Now compression is similar to pressure in this project actually, pressure causes compression but they are a little bit different. Take another example an air compressor. The machine inside is compressing and compressing because it is trapped. When you cut out the bottoms of the cups you see that the cups fall and you do too this is compression in this experiment. You can compress almost anything in the

Experiment Two: Stiffness Report from laboratory work performed on 12 May 2011 as a part of the unit of study CIVL2201 Structural Mechanics

\parindent{\ \ \ }Figure~\ref{fig:mdg} shows the average strain at different time instants for various mesh densities. The variation in the results obtained with the finest mesh and the mesh immediately next to the finest one is less than 5\%. Hence, we can reasonably assume that the study reached convergence. The difference in results obtained from the dense mesh (i.e., mesh 6) and coarse mesh (i.e., mesh 3) is less than 8\%.

Until the end of the experiment, 21 hysteresis cycles were applied to Specimen 6 at both forward and backward. Specimen 6 reached 47.94 kN lateral force and +19.71 mm displacement at 19 hysteresis forward cycle and -48.01 kN lateral force and -10.84 mm displacement at 19 hysteresis backward cycle. When Specimen 6 reached to ultimate lateral load-carrying capacity, interstory drift value was 1.5% at forward and interstory drift value was 1.1% at backward. Load controlled program and base shear versus second story displacement hysteresis curve of Specimen 6 are shown in Fig. 16.

The web of the prefabricated truss can be analyzed as a column. Burdzik analyzed the web of a truss as a non-continuous compression member. Columns must take the effective length into account for both the in plane and out of plane bending. The connection type, continuity, and capacity of adjacent members affect the degree of restraint for the web member (Burdzik,

The UTM machine used for tensile testing is a UTM system corporation manufactured machine capacity of 600KN the machine is a hydraulic powered. The UTM machine is very flexible and many different tests (tensile test, bending test, etc.) are run on this machine by changing various dies and rollers set on the hydraulic actuator. Hydraulic wedge grippers are used for the tensile tests. The machine has a capacity to work with different cartridges to meet the needs of the materials being tested. The cartridges can be changed with a little effort and some changes in the controller values. At the end of testing all pieces are cut from the welding points and tensile test were carried

Where P is the applied force, L is the length of beam, E is the modulus of elasticity of aluminum, and I is the moment of Inertia.

This paper presents the mechanical properties of high strength structural steel and mild structural steel at elevated tempera- tures. Mechanical properties of structural steel at elevated temperatures are important for fire resistant design of steel structures. However, current design standards for fire resistance of steel structures are mainly based on the investigation of hot-rolled carbon steel with normal strength, such as mild steel. The performance of high strength steel at elevated temperatures is unknown. Hence, an experimental program has been carried out to investigate the mechanical properties of both high strength steel and mild steel at elevated temperatures.