Machine design 2 selection of materials, stressing. aim. to introduce the structure of machines, the function, type and load of machine elements and the main methods of designing them Main chapters of this semester: Fits & tolerances Basics of stressing Joints Drive systems 1. Requirements.
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3 hours weekly (mostly 2 lecture, 1 laboratory)
Attendance and participation are important!
Engineering is not a spectator sport.
(allowed absence four occasions)
Tests (tolerances, stressing) 10+10 points
Assignments (valve, key joint, coupling) (10+15+15)
Written exam 60 point
optimum - opportunism
static cyclic dynamic
Stress distribution uniforn/linear
stress – strain diagrams
ductile – carbon steel
rigid – cast iron
elastic (Young) modulus: E [MPa]
(Hook’s law s = Ee)
shear modulus: G [MPa] (t = Gg)
elastic limit Rp0.2
yield strength ReH
ultimate tensile strength Rm
maximal strain A
Charpy (V-notch) test Kcu
αk > 1
dynamic load factor
Depending on machine type & size (handbooks, measurements, calculations)
propagating crack – final static break
90-95% of all failures!
many factors - stohastic phenomenon
cycle assymetry ratio
cycle mean stress ratio
to be onthesafesideuse SF
n>1 (1.15 ~ 8-10!)