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CONSTRUCTION OF EPYURES OF INTERNAL POWER FACTORS

Lecture



The task of determining the greatest stresses begins with the search for a section in which the greatest internal forces act.
In the case of direct transverse bending of a cantilever beam loaded with a concentrated force P (Fig. 1.9), the greatest bending moment will be in section A at the embedment, since the maximum bending moment here is equal to M A = P * a.
CONSTRUCTION OF EPYURES OF INTERNAL POWER FACTORS
Fig. 1.9
A dangerous section is a cross section in which the greatest internal forces act.
Where the dangerous section will be located in the more complicated loading case (Fig. 1.10) it is difficult to answer right away, since the concentrated bending moment M and the distributed load q bend the beam downwards, and the concentrated force P - upwards, while the moment values ​​from each type of load are different .
CONSTRUCTION OF EPYURES OF INTERNAL POWER FACTORS
Fig. 1.10
Therefore, for complex cases of loading, it is necessary to know the law of variation along the beam length of a bending moment or other internal force (for example, the longitudinal force N, the lateral force Q or the torque M cr ).
This law can be depicted with the help of special graphs called diagrams.
Plot is a graph depicting the law of variation of internal force along a rod. Each ordinate of the plot represents the amount of force in the corresponding cross section of the rod.
Plotting by the method of sections is performed in four stages.
From the equation sections compiled at the fourth stage of the method, we express the sought internal force factors: N, Q x , Q y , M x , M y, and M z (M kr ).
Using the obtained expressions, we construct graphs of changes in the WSF - L /, Mx, etc. along the length of the rod - epures.
created: 2014-09-20
updated: 2024-11-09
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Strength of materials

Terms: Strength of materials