图示某危险点的应力状态,其主应力[img=17x17]1802d1d0a26b7ea.png[/img]和最大切应力[img=33x17]1802d1d0aaf4fad.png[/img]为( )。[img=148x135]1802d1d0b624ea8.jpg[/img] A: 130 MPa, 80 MPa B: 120MPa,30 MPa C: 150MPa,60 MPa D: 140 MPa,, 80MPa
图示某危险点的应力状态,其主应力[img=17x17]1802d1d0a26b7ea.png[/img]和最大切应力[img=33x17]1802d1d0aaf4fad.png[/img]为( )。[img=148x135]1802d1d0b624ea8.jpg[/img] A: 130 MPa, 80 MPa B: 120MPa,30 MPa C: 150MPa,60 MPa D: 140 MPa,, 80MPa
某单元体的三个主应力分别为-50MPa,60MPa,80MPa,最大切应力的数值为( )。 A: 70 MPa B: 45 MPa C: 65 MPa D: 20MPa
某单元体的三个主应力分别为-50MPa,60MPa,80MPa,最大切应力的数值为( )。 A: 70 MPa B: 45 MPa C: 65 MPa D: 20MPa
图示点的应力状态,应力的单位为MPa,其主应力、最大切应力是() [img=171x176]17e0ad40bd6e004.jpg[/img] A: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=62.1MPa B: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=62.1MPa C: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=49.2MPa D: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=49.2MPa
图示点的应力状态,应力的单位为MPa,其主应力、最大切应力是() [img=171x176]17e0ad40bd6e004.jpg[/img] A: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=62.1MPa B: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=62.1MPa C: σ1=80MPa,σ2=54.2MPa,σ3=-44.2MPa,τmax=49.2MPa D: σ1=54.2MPa,σ2=-44.2MPa,σ3=80MPa,τmax=49.2MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]18034a2418c8168.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]18034a2418c8168.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]1803c0be45fe8e3.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]1803c0be45fe8e3.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]1802f411d9c20d7.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
一点处的应力状态分别如图所示,试求该点处的主应力及最大切应力。(图中应力单位为MPa)[img=334x298]1802f411d9c20d7.png[/img] A: 130MPa, 30MPa, -30MPa, 80MPa B: 30MPa, -30MPa, -130, 80MPa C: 130MPa, -30MPa, -30MPa, 80MPa D: 130MPa, 30MPa, -30MPa, 40MPa
如果一个零件的应力循环特性r=0.6,应力幅σ[sub]a[/]=80MPa,则此时最大应力σ[sub]max[/]=(________)MPa,最小应力σ[sub]min[/]=(________)MPa,平均应力σ[sub]m[/]=(________)MPa 。
如果一个零件的应力循环特性r=0.6,应力幅σ[sub]a[/]=80MPa,则此时最大应力σ[sub]max[/]=(________)MPa,最小应力σ[sub]min[/]=(________)MPa,平均应力σ[sub]m[/]=(________)MPa 。
已知σ1=80Mpa,σ2=0,σ3=-80Mpa,则单元体最大切应力为( ) A: 60Mpa B: -60Mpa C: 80Mpa D: -80Mpa
已知σ1=80Mpa,σ2=0,σ3=-80Mpa,则单元体最大切应力为( ) A: 60Mpa B: -60Mpa C: 80Mpa D: -80Mpa
一般情况下,火成岩、变质岩及水成岩试件的强度分别不宜低于( )。 A: 80MPa、30MPa、60MPa B: 80MPa、60MPa、30MPa C: 60MPa、80MPa、30MPa D: 30MPa、60MPa、80MPa
一般情况下,火成岩、变质岩及水成岩试件的强度分别不宜低于( )。 A: 80MPa、30MPa、60MPa B: 80MPa、60MPa、30MPa C: 60MPa、80MPa、30MPa D: 30MPa、60MPa、80MPa
The average stress σm and stress amplitude σa of the alternating stress in the figure are respectively ( ).[img=239x154]17de8405f43ce66.jpg[/img] A: σm = 40MPa,σa = -120 MPa B: σm = -40MPa,σa = -40 MPa C: σm = 0MPa,σa = 120 MPa D: σm = -40MPa,σa = 80 MPa
The average stress σm and stress amplitude σa of the alternating stress in the figure are respectively ( ).[img=239x154]17de8405f43ce66.jpg[/img] A: σm = 40MPa,σa = -120 MPa B: σm = -40MPa,σa = -40 MPa C: σm = 0MPa,σa = 120 MPa D: σm = -40MPa,σa = 80 MPa