Eccentrically loaded tie - Lab Report Example

Hounsfield tensometer testing device – a machine that was used to assess to what level our specimen expanses under the stress of the material and some other tensile features of materials like the tensile strength – and; We estimated and noted the eccentricity (e) and dimension of our specimen cross-section. We also applied a negligible holding load so as to eliminate the initial slackness from the set up. The recording mercury was also zeroed. After all that, our strain gauge switch as well as the balance unit for every gauge was set up.

We recorded the measurement of the strain at every position for any increment in load up. In order to ascertain the strains of every sample under the adopted load, we connected the six strains to a six-channel strain gauging bridge. Figure 1 below illustrate the experimental process. In order to determine our strain gauge values, position of gauge depth from centroid, and average strain, we proceeded as follows (distance between the gauge are shown in parentheses in table 1 above): The figure 3 above displayed the distribution of stress across the tie as the measurement was proportional to the stress.

The slope of NQS in the above diagram is proportional to disparity in strain as a results of bending. This was due to algebraic addition of axial and bending stresses shown below. From our results, the estimated e (19.125mm) was higher than our calculated e (18.48131738). This gave us a percentage error of only 3.3657%, implying that the accuracy of our results was around 96.6%. With this, we could confidently say our experiment was successful despite the 3.36% error. This percentage error might have been occasioned by: As for the stress distribution diagram, the shape was occasioned by the combination of bending and axial stress applied to tie bar material.

This was consistent with the findings in Sinha (2002). Sheer forces and bending moments in the beam always determine the value of