Engineering, 23.09.2019 00:10 Throwback633

5. the cutter bars of two combine harvesters from different manufactures develop different failure types with time. cutter bar a loses the knife sharpening after 10 seasons, while cutter bar b does not lose the knife sharpening but some blades have to be replaced time to time due to local fracture of the edge. through measuring the volume and the weight the density of both blades are around 7.8 – 7.9 kg/dm3. the hardness of the blades from a is 2.2 gpa while the hardness of the blades from b is 8 gpa. discuss two possible manufacturing differences that would lead to this situation. use suitable references to support your discussion. suggest two possible technologies to improve the life for bar a. suggest a way to reduce the brittleness of bar b. justify your suggestions and compare with real examples if possible. [hint] use heat treatment graphs, composition-mechanical properties, material data, surface engineering…

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5. the cutter bars of two combine harvesters from different manufactures develop different failure t...