Thin profile element

 

The invention relates to the production of thin-walled core elements and can be used in construction and other industries. The invention consists in that the thin-walled core element having on the wall corrugations, including rectilinear and curvilinear sections, separately passing each other, and form which are perpendicular to the longitudinal axis of the element, the moment of inertia of the cross section of the corrugations relative to its neutral axis per unit wavelength of the corrugations defined in the formula expression. Set the parameters of the transverse corrugations in relation to each other, with the height of the wall of the profile element and strength characteristics of the material will provide increased bearing capacity, reduce material consumption profile element when its on transverse bending, shear, longitudinal and transverse compression, and combinations thereof. 16 Il.

The invention relates to the production of a piece or molded thin-walled profile elements with different cross-sectional shape (including composite), manufactured from metal, plastics, composite materials, and moutenot.

Known profile element includes a closed corrugations placed asymmetrically relative to the longitudinal axis of the profile, and two flat boundary element (patent RU 1360851, CL 21 D 5/06, publ. 1987).

The disadvantage of this core element is its low strength and stiffness in bending, longitudinal and transverse compression and shear in the plane of the wall.

Known bent channel profile element made with rounded sections mate its individual parts and containing on the wall convex outward open corrugation with defined and interrelated dimensions (patent RU 2049575, CL 21 D 5/06, publ. 1995).

The disadvantage of this element is the low strength due to the increased deformation of the cross-section in transverse compression.

The closest in technical essence and the achieved result is a core element containing on the wall corrugations, including rectilinear and curvilinear sections, separately passing each other and form which are perpendicular to the longitudinal axis of the element (Curved profiles of hire. Handbook /Edited. Ed. I. S. Crisiscore. - M.: metallurgy, 1967, S. 127, 132, 289, 292).

Insufficient is that is

The proposed solution is aimed at the creation of such a thin-walled profile element, which due to the formation in the wall of the transverse corrugations with specified parameters in relation to each other, with the height of the wall of the profile element and strength characteristics of the material will provide increased bearing capacity, reduce material consumption profile element when its on transverse bending, shear, longitudinal and transverse compression, and combinations thereof.

The essence of the invention lies in the fact that the thin-walled core element containing on the wall corrugations, including rectilinear and curvilinear sections, separately passing each other, and form which are perpendicular to the longitudinal axis of the element, characterized in that the moment of inertia of the cross section of the corrugations relative to its neutral axis per unit wavelength of the corrugations is determined from the expressionwhere=3,14; h is the calculated height of the wall profile, mm;- conditional flexibility walls; R - rated compression resistance of the material, kg/mm2; E - modulus of elasticity (kgf/mm2;- it is with regard to the proposed technical solution: Fig.1-6 shows the different types of thin-walled elements with corrugations on the walls; in Fig.7 - type And thin-walled elements, is shown in Fig.1-5; Fig. 8 is a view In thin-walled element, shown in Fig.6; Fig.9-13 - cross-section of thin-walled elements, is shown in Fig.7 and 8; Fig.14-16 - nodes of thin-walled elements, is shown in Fig.1-5.

When solving a task, it was found that the highest load-carrying capacity of thin-walled profile element with transverse corrugations, including rectilinear and curvilinear sections, separately passing each other, and matchingdepends on the moment of inertia I of the cross section of the corrugations relative to the neutral axis, as defined by the expression

where=3,14; h is the calculated height of the wall profile;=2,5...3,5 - conditional flexibility walls; R - rated compression resistance of the material; E is modulus of elasticity;- coefficient, which is determined from the ratios of l/h and s3/12I and within 0,27...2; l is the length of the flute (the height of the wall profile) lh; s - wall thickness profile (s=0,5...25 mm), for flute, composed by its direction and enclosing, when b2/s20 should be observed conditions
Rs0,45;

where; Ry- the calculated Flexural resistance of the material; Rs- calculated shear strength (shear) material; b - the greatest width of the straight part of the flute or the greatest length of the arc of the curved section of the corrugations of the same sign of curvature (bl); where- the average radius of curvature calculation section flute;is the Poisson's ratio of the material (=0,2...0,4), for flute, composed by their guides from curved sections or including them, when b2/s>20 must comply with the condition
3,8E.(s/b)2[1+0,80(b/l)2]+0,08E s/Rs.

Example. Bent With equal-shaped thin-walled profile element with a design height of the wall (golany pressure trapezoidal transverse flute length l= 150 mm, with the greatest width of straight part b=10 mm, height hg=5 mm, a wavelength of a=30 mm and wall thickness s=2 mm

The Material Of The Article. 235 with the calculated resistance to compression and bending R=Ry=21 kgf/mm2with the calculated shear Rs=13 kgf/mm2, elastic modulus E= 2,1104kgf/mm2, Poisson's ratio=0,3. The moment of inertia I of the cross section of the corrugations relative to its neutral axis per unit wavelength of the corrugations I=9,51 mm4/mm

Then, taking conditional flexibility walls=3, we get

From the ratios of l/h=150/242=0.62 s3/12I=23/129,51=0,0701 get (from reference data)=2,5.


To have the condition at a desired value of the moment of inertia of the cross section of the corrugations relative to its neutral axis per unit wavelength of the corrugations.

For flute, composed by their guides of straight flat sections,

0,45= 0,459,11103= 4,11 is a ditch, composed by their guides from linear sections.

Thus, the proposed invention allows for increased bearing capacity, reduce material consumption profile element.


Claims

Thin profile element containing in its wall corrugations, including rectilinear and curvilinear sections, separately passing each other, and form which are perpendicular to the longitudinal axis of the element, characterized in that the moment of inertia of the cross section of the corrugations relative to its neutral axis per unit wavelength of the corrugations is determined from the expression

where= 3,14;
h is the calculated height of the profile element, mm;
- conditional flexible wall;
R - rated compression resistance of the material, kg/mm2;
E - modulus (kgf/mm2;
- factor, within 0,27. . .2

 

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