. The action of materials under stress; . have q max. = \ p^.d 181, Combined Stresses.—The^J___ action line of P maybe taken for theaxis of X. Two equal and oppositeforces, pull or thrust, may then beapplied along the axis of Y, and thenormal and tangential unit stressesfound on the plane just discussed;and similarly for the direction Z. The normal unit stresses,since they act on the same area, may then be added algebra-ically, and the shearing stresses may be combined; finally aresultant oblique unit stress may be found on the given more convenient method will, however, be developedan
. The action of materials under stress; . have q max. = \ p^.d 181, Combined Stresses.—The^J___ action line of P maybe taken for theaxis of X. Two equal and oppositeforces, pull or thrust, may then beapplied along the axis of Y, and thenormal and tangential unit stressesfound on the plane just discussed;and similarly for the direction Z. The normal unit stresses,since they act on the same area, may then be added algebra-ically, and the shearing stresses may be combined; finally aresultant oblique unit stress may be found on the given more convenient method will, however, be developedand used in the following sections. As most of the forceswhich act on engineering structures lie in one plane or parallelplanes, such cases chiefly will be considered. 182. Unit Shears on Planes at Right Angles.—If, inthe preceding illustration, the unit stresses, both normal andtangential, are found on another plane N which makes anangle 0 = 90° — 0 with the right section, there will result p^ — p^ cos^ 0 — /, sin- 0\ q — B .N }S-2. INTERNAL STRESSES. 185
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectstrengt, bookyear1897
