While visiting your buddy who owns a machining joint in East Cleveland, you talk
ID: 1767344 • Letter: W
Question
While visiting your buddy who owns a machining joint in East Cleveland, you talked shop with him over a lunch of kielbasa and chili (it has beans in it). He lamented that one of his machined parts hasn't worked so well lately and his customer is at his throat. What he is trying to make is a clasp designed to grab a round bar, and he makes a drawing for you While you try to suppress yourself from asking him why he envelopes around, he explains that the clasps are made out Síde view Top view (installed) carries of a NisoAlao alloy. The clasp is a single piece of metal, and when the clasp is being installed unto the rod, it must first "open up" so the jaws can make their ways around the rod What made his client fume is after installation, the clasp does not grasp the rod tightly, and he accuses your buddy of not machining the clasps precisely enough. Your buddy is certain that his techniques are impeccable: he has machined the clasp just a bit smaller than the rod such that there is a spring force that will hold the clasp in place. The resulting material is also quite ductile he cla Sp rod Top view during installation finds, so there wasn't a problem with brittle fracture You ask him about the material properties of the Ni6oAl4o alloy he is using and what condition he receives the alloy in. He mentions that elastic modulus of the alloy is 250 GPa, and the yield strength was 340 MPa The alloy was heat treated at 1200 °C for 2 hours and quickly water quenched (fast cooling) to room temperature so that phase changes would not occur during this process. Being the versatile engineer that you are, you quickly do a mental calculation based on what you learned in the solid mechanics class, and determined that the maximum strain during installation on the clasps was 0.2%, while you were doing this, your buddy mentioned that he has made like 10,000 units of this clasp, and would really love to have a way of fixing the loosening problem without changing their shape (otherwise he would have to re machine each one of them again)Explanation / Answer
Answer 3.c.
As the clasp is not gripping the rod tightly, the reason must be strain because of which it fails to perform it's duty and also with the material being ductile the chances strain increases and because of this it is not able to grip the rod tightly.
Answer 3.d.
I would like to increase the hardness of material by heat treatment process by doing this I can remove the previous stresses which are formed during operation and secondly it will make the material more strain resistant.
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