Stress Pressure Relationships for Steel and Concrete Dissertation

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EN1029 Clinical: Compression Tests

Objective

To plot stress-strain relationships pertaining to steel and concrete the moment tested in compression.

Products to be used

Avery Screening Machine & Compression Press

Experiment guidance

You will be supplied with two " identical” stainlesss steel cylinders (specimens A & B), 3 " identical” concrete prisms and 3 " identical” concrete cube. Measure the individuals and bring dimensioned sketches of the individuals. One of the metallic specimens, A, will have power strain gauge (and cabling) attached.

1 ) [Watch Clip 1] You can put steel example of beauty A, with all the gauges fastened, in the Avery Testing Machine [see " Pictures. pdf” in Learning Central] and apply compressive loads in increments of 5kN. Record the corresponding changes in length of the example of beauty via the strain readings. [Readings of loading and unloading succumbed " Results. pdf” about Learning Central. ] The maximum fill applied must not exceed 50kN. Unload at stated intervals of 5kN and again note beliefs of insert and stresses. Note also the residual strain after unloading.

2 . [Watch Video 2] Remove example of beauty A in the test equipment and place specimen B inside the compression press machine [see " picture. pdf” on Learning Central]. Improve the load until failure happens (typically, increase to around 500kN). Note the utmost load, plus the shape and sizes of specimen N after the test.

3. [Watch Video 3] Place among the concrete cube in the compression press and measure the shortening of the specimen with a call gauge for increasing insert. Remove the call gauge and test to failure, recording the maximum fill. Repeat with the other two cubes (which should be identical) but record only the failure loads. [Clips your five & six – via Expedition Workshed - as well show tangible cube test out at failure point. ] (Note that although the " design strength” of the concrete was 30 N/mm2, that is the anticipated strength by 30 days, whereas the specimens were checks at age of less than a week, and they had thus not yet reached full strength. )

4. [Watch Clip 4] Repeat the concrete cube experiment with the concrete prism.

Report producing

Use the report template. Depth what happened inside the experiments and how the objective of the exercise was met (or not). Story and clarify the stress-strain relationships pertaining to steel and concrete compression test. Receive the ultimate strains and also the principles for Young's modulus plus the type of inability observed and comment on the values received.

Reference

1 ) Ormandy, P. G., 1968 " An intro to Metallurgical Laboratory Testing”, Pergamon Press. 2 . BS1881 Part 5, 1970, Techniques of Testing Advantages of Tangible. Steel Individuals

Specimen A (load inside Elastic Limit)

|Load (kN) |Micro-Strain (x 10-6) |Axial shortening (mm) |Strain |Stress (kN/mm2) | |0 |0 |0 |0 |0 | |2 |-19 |9. 49 x10-4 |1. 90 x10-5 |4. 15 x10-3 | |5 |-46 |2. 40 x10-3 |4. 60 x10-5 |10. 25 x10-3 | |10 |-93 |4. 66 x10-3 |9. 31 x10-5 |20. forty-nine x10-3 | |15 |-141 |7. 05 x10-3 |1. 41 x10-4 |30. 74 x10-3 | |20 |-187 |9. thirty four x10-3 |1. 87 x10-4 |40. 98 x10-3 | |25 |-234 |11. 69 x10-3 |2. 34 x10-4 |51. twenty three x10-3 | |30 |-270 |13. 49 x10-3 |2. 70 x10-4 |61. twenty four x10-3 |...



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