Automotive body panels have been a prime target for weight reduction through the

Question

Automotive body panels have been a prime target for weight reduction through the use of a thinner material, higher-strength steels, and lightweight alternative materials such as aluminum and polymeric sheet-molding compound. Associated with each candidate material is a related manufacturing or fabrication system. In order to select "best" material, we need to evaluate both the material and the related processing with respect to a number of factors including: mechanical properties, weight, corrosion resistance, cost of material methods and ease of manufacture, surface finish, and etc. Body panels were traditionally made from drawing-quality; low-carbon steel (such as AISI 1008 or 1010) formed by traditional sheet metal forming, and assemble by spot welding. Reflect on the key factors as listed above, discuss the pro and cons of the following four materials; The conventional low-carbon steel Advanced high-strength steel Aluminum Polymeric sheet molding compound The traditional low-carbon steels have largely been replaces by thinner gauge high strength steels. What is fabrication difficulties would be encountered during the transition? How was the fabrication system changed to accommodate the change in material?

Explanation / Answer

solution:

1)comparison between properties of low carbon steel,advance or alloy steel ,alluminium and polymer is as follows

2)when replace plain steel by alloy steel ,then due to difficultis of alloy steel to cast it in difficult shape,we cannot produce it by casting and we have to produce it by sheet metal working and force require for shearing is also increased because of high strength of alloy steel.this are difficulties to fabrication and it will increase shearing force and hence punch and die should be choose of better strength and hence cost of dies is also increased.

3)but nowadays in many application alloy steel is taking position of plain steel as they are more reliable than plain steel.

low carbon steel advance or alloy steel alluminium polymer compund mechanical property ductile,high fatigue and impact strength,high toughness,high stiffness,high resilience,less hardness ductile,high strength,high fatigue and tensile strength,high wear and creep resistance highly ductile and malleble,high toughness,high thermal and electrical conductivity low in mechanical properties weight less than alloy and more than alluminium and polymer in weight weight is more all of them lighter than steel and alloy steel light in weight of all of them corrosion resistance highly corrosive good corrosion resistance high corrosion resistance excellent cost cheap costly than steel and polymer but less than alluminium costlier than all of them cheapest method of manufacturing easily manufacture by sheet metal working or casting for door panel difficult to cast and produce by sheet metal working produced by casting or rolling produced by extrusiin,moulding surface finish medium surface finish poor surface finish good surface finish best surface finish

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.