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You have been tasked with designing a set of gears made from a material with a Brinell hardness (Hg) of 201 MPa. Previously your company has produced gears with a commercially, polished surface finish, but your boss is interested in how much the bending strength would be decreased if a machined surface was used instead, with all other factors kept constant. Considering the surface factor figure and the AGMA equation for bending strength presented below, approximately what percentage decrease in bending strength (S,) would we expect to see changing from a commercial polished finish to machined surfaces? Hardness (Hg) 120 160 200 240 280 320 360 400 440 480 520 1.0 `Mirror-polished 0.9 Fine-ground or commercially polished 0.8 - Machined or cold-drawn 0.7 0.6 0.5 Hot-rolled 0.4 0.3 As forged 0.2 Corroded in tap water 0.1 Corroded in salt water 60 80 100 120 140 160 180 200 220 240 260 Tensile strength S, (ksi) St Sn = S'nCskrk¢kms 28% 20% O 23% O 7% Surface factor C

You have been tasked with designing a set of gears made from a material with a Brinell hardness (Hg) of 201 MPa. Previously your company has produced gears with a commercially, polished surface finish, but your boss is interested in how much the bending strength would be decreased if a machined surface was used instead, with all other factors kept constant. Considering the surface factor figure and the AGMA equation for bending strength presented below, approximately what percentage decrease in bending strength (S,) would we expect to see changing from a commercial polished finish to machined surfaces? Hardness (Hg) 120 160 200 240 280 320 360 400 440 480 520 1.0 `Mirror-polished 0.9 Fine-ground or commercially polished 0.8 - Machined or cold-drawn 0.7 0.6 0.5 Hot-rolled 0.4 0.3 As forged 0.2 Corroded in tap water 0.1 Corroded in salt water 60 80 100 120 140 160 180 200 220 240 260 Tensile strength S, (ksi) St Sn = S'nCskrk¢kms 28% 20% O 23% O 7% Surface factor C

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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You have been tasked with designing a set of gears made from a material with a Brinell hardness (Hg) of 201 MPa. Previously your company has produced gears with a commercially polished surface finish, but your boss is interested in how much the bending strength would be decreased if a machined surface was used instead, with all other factors kept constant. Considering the surface factor figure and the AGMA equation for bending strength presented below, approximately what percentage decrease in bending strength (S,) would we expect to see changing from a commercial polished finish to machined surfaces? Hardness (Hp) 120 160 200 240 280 320 360 400 440 480 520 1.0 `Mirror-polished 0.9 Fine-ground or commercially polished 0.8 - Machined or cold-drawn 0.7 0.6 0.5 Hot-rolled 0.4 0.3 As forged 0.2 Corroded in tap water 0.1 Corroded in salt water 60 80 100 120 140 160 180 200 220 240 260 Tensile strength S, (ksi) St Sn = S'nCskrk¢kms O 28% O 20% O 23% O 7% Surface factor C,
Transcribed Image Text:You have been tasked with designing a set of gears made from a material with a Brinell hardness (Hg) of 201 MPa. Previously your company has produced gears with a commercially polished surface finish, but your boss is interested in how much the bending strength would be decreased if a machined surface was used instead, with all other factors kept constant. Considering the surface factor figure and the AGMA equation for bending strength presented below, approximately what percentage decrease in bending strength (S,) would we expect to see changing from a commercial polished finish to machined surfaces? Hardness (Hp) 120 160 200 240 280 320 360 400 440 480 520 1.0 `Mirror-polished 0.9 Fine-ground or commercially polished 0.8 - Machined or cold-drawn 0.7 0.6 0.5 Hot-rolled 0.4 0.3 As forged 0.2 Corroded in tap water 0.1 Corroded in salt water 60 80 100 120 140 160 180 200 220 240 260 Tensile strength S, (ksi) St Sn = S'nCskrk¢kms O 28% O 20% O 23% O 7% Surface factor C,
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