Lecture #9 Shear center.

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Presentation transcript:

Lecture #9 Shear center

SHEAR STRESSES RELATED QUESTIONS shear flows due to the shear force, with no torsion; shear center; torsion of closed contour; torsion of opened contour, restrained torsion and deplanation; shear flows in the closed contour under combined action of bending and torsion; twisting angles; shear flows in multiple-closed contours. 2

SHEAR CENTER - ILLUSTRATION 3

PROPERTIES SHEAR CENTER 1. The transverse force applied at shear center does not lead to the torsion of thin-walled beam. 2. The shear center is a center of rotation for a section of thin-walled beam subjected to pure torsion. 3. The shear center is a position of shear flows resultant force, if the thin-walled beam is subjected to pure shear. 4

CALCULATION OF SHEAR CENTER POSITION FOR OPENED CROSS SECTION Way of calculation: calculate shear flows q from the arbitrary chosen force Qy; calculate the moment of shear flows MC (q) about some point C; the X coordinate of SC will be make similar calculations to find YSC. 5

CALCULATION OF SHEAR CENTER POSITION FOR OPENED CROSS SECTION - EXAMPLE Given cross section Continuous approach Discrete approach Value of vertical force is chosen arbitrary (100 kN). 6

CALCULATION OF SHEAR CENTER POSITION FOR OPENED CROSS SECTION - EXAMPLE Discrete approach Continuous approach 7

CALCULATION OF SHEAR CENTER POSITION Properties of symmetrical cross sections: 1) The shear center lays on the axis of symmetry. 2) Thus, for twice symmetrical section the shear center is the point of symmetry axes intersection. If the cross section is composed of segments converging in a single point, this point is the shear center: 8

CALCULATION OF SHEAR CENTER POSITION FOR CLOSED CROSS SECTION For closed cross section, we use equilibrium equations for moments to find q0. Thus, moment of shear flows MC (q) would depend on the position of force Qy and would not be useful to find XSC. We find the shear center position from the condition that the twist angle should correspond to the torsional moment which is calculated as Qy multiplied by the distance to shear center: 9

CALCULATION OF SHEAR CENTER POSITION FOR CLOSED CROSS SECTION Thus, we need to calculate the torsional rigidity of wingbox G·Ir and relative twist angle df/dz : We will study these calculations in detail next semester. 10

CALCULATION OF SHEAR CENTER POSITION FOR CLOSED CROSS SECTION - EXAMPLE shear center 11

… Internet is boundless … WHERE TO FIND MORE INFORMATION? Megson. An Introduction to Aircraft Structural Analysis. 2010 Paragraph 16.2.1 for opened cross sections, paragraph 16.3.2 for closed cross sections … Internet is boundless … 12

Examples of shear flow calculations TOPIC OF THE NEXT LECTURE Examples of shear flow calculations All materials of our course are available at department website k102.khai.edu 1. Go to the page “Библиотека” 2. Press “Structural Mechanics (lecturer Vakulenko S.V.)” 13