摘要:
Joined portions (14) of plate materials to be joined (12a, 12b), which are joined with each other, are joined by a plurality of connector bolts (16a-16d). The connector bolts (16a-16d) are arranged in the direction in which a tensile load (F) is applied. The joined portions (14) of the plate materials to be joined (12a, 12b) are respectively configured of four regions (T 1 -T 4 ) that have different elastic moduluses. The elastic moduluses of the regions (T 1 -T 4 ) have the following relation: elastic modulus (E 1 )(region T 1 ) > elastic modulus (E 2 ) (region T 2 ) > elastic modulus (E 3 ) (region T 3 ) > elastic modulus (E 4 ) (region T 4 ). Since end-side bolts (36a, 36d) are disposed in the low elasticity regions (T 1 , T 4 ), loads shared by the connector bolts can be averaged.
摘要:
The invention relates to a screw (30) having a shaft (32) comprising a wooden thread (34) and to a connection of a component (10) to a substructure (20) made of cross-cut timber or brittle material, produced using said screw. The shaft (32) is designed as a ductile strain region (40) for a portion of the length thereof, said region being plastically deformable over the majority of the usable tensile strain. The screw is made of a low-strength steel having a tensile strength of 200 to 800 N/mm 2 . The screw (30) is not pretensioned when producing the connection. The tensile force that can be transferred between the wooden thread (34) and the substructure (20) is greater than the maximum tensile force that can be applied to the strain region (40). The anchoring of the wooden thread (34) and the diameter Dh of same are thereby selected with respect to the implementation of the strain region (40) so that the strain region (4) fails before the threaded connection in the region of the anchoring of the wooden thread (34) fails. The intrinsically brittle cross-cut grain connection becomes a ductile joint by using the screw (30) according to the invention.
摘要:
A connecting arrangement is provided. The connecting arrangement includes a bolt (120) with at least one end having a fastening portion (121), wherein the fastening portion (121) has a tapered shape; a segmented thread block (130) having a thread on the outer side and being adapted for fitting the fastening portion (121) of the bolt (120) in a locked position; and fastener (140) having a thread on the inner side, wherein the fastener (140) is adapted for being screwed on the segmented thread block.
摘要:
A stress defender hole (18) in a component is provided with a countersunk portion (19). The countersunk portion (19) increases the stress concentration on to the defender hole (18), hence reducing stress elsewhere in the component.
摘要:
Die Dauerfestigkeit eines Bolzens zum Verbinden eines Startgerätes für Flugkörper mit dem Pylon eines Trägerflugzeuges soll durch Verminderung der inneren und äußeren Kerbwirkung erhöht werden. Der Bolzen ist mit einem Kopf (10) versehen, der von einem scheibenförmigen Abschnitt (12) größeren Durchmessers und einem daran anschließenden zylindrischen Abschnitt (14) geringeren Durchmessers gebildet ist, und mit einem Schaft (16) mit einem glatt zylindrischen Abschnitt (18) und einem daran anschließenden Gewindeabschnitt (20). Der Bolzen ist ein Schmiedestück aus einem wärmebehandelten höchstfestem Chrom-Molybdän-Vansdin-Stahl mit 0,4 C, 5 Cr, 1,3 Mo und 0,5 V, der nach der Wärmebehandlung ein feinkörniges Vergütungsgefüge ohne Seigerungszonen besitzt. Die Oberfläche ist in einer eine Wasserstoffversprödung ausschließenden Weise behandelt. Die Krümmungsradien von Innenkanten sind größer als 0,6 mm. Das Gewinde und der Schafteinstich des Bolzens sind gerollt. Der Kopf (10) des Bolzens weist einen gestauchten Innensechskant (26) auf.
摘要:
A structural fuse 1 is configured to shear upon an application of a predetermined load and comprises a plurality of elongate reinforcing elements 4 in a metal matrix 5. The provision of a so-called metal matrix composite results in a fuse that is lighter in weight than a conventional metal pin and has improved fatigue properties and hence a longer operating life. The load (or range of loads) at which the fuse is arranged to shear can be engineered by careful arrangement of the orientation of the reinforcing elements, and by selecting the proportion of reinforcing elements in the matrix. Thus, a fuse having a narrower load range than hitherto achievable can be produced.