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The Load-Displacement (or Load Extension) and stress strain diagrams are two diagrams identical in shape. See below. The main visible difference is the values on axis (which are at first glance neglected). So, it is natural when you first encounter them to question why do you want to learn about a stress and strain diagram which has obscure quantities (as ...


2

There are at least two contributing factors to that: a) development of grains (the following is mainly an excerpt from this question ) and this Usually thinner steels exhibit higher yield points (see cold roll sheet catalog page.8) and ultimate tensile strengths (see Steel construction) because, sheets of steel, that come out of rolling processes (especially ...


1

For hot rolled , the thicker section cools slower so has coarser pearlite and coarser grain size because the grains have more time to grow larger during the slow cool. A secondary factor is the thicker section is worked less / less strain to refine grains. The lower strength affect of the slower cooling thick sections also occurs during normalize and quench ...


1

According to this reference the second moment of area for the HFS series 2020 and 3030 is respectively (for each beam) $0.74\cdot 10^4 mm^4$ and $1.89\cdot 10^4[ mm^4]$. To give it some perspective the second moment of area you currently have with the MDF (610mm X9mm) is about is about $3.7\cdot 10^4 [mm^4]$. This means that the 3030 will exhibit (on its ...


1

I don't have idea about the material you are mentioning, so no comment there. Instead, I suggest to provide bracings and additional support beams, using shelve angles, as shown below. Also, adding 1/2" - 3/4" plywood board can stiffen the shelve bed. Note, you shall confirm the shelve is rated for your application.


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