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Kuldeep answered on
Oct 19 2020
Static and fatigue behavior of hollow section t- joints
Static and fatigue behavior of hollow section t- joints
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Contents
Introduction 3
Literature Review: Static and fatigue behavior of hollow section t- joints 4
Types of hollow Section on with diagrams 4
Types of welding 7
Methods to calculate fatigue life 9
Hot spot stress method 9
B) Classification 11
Stress concentration factors 14
Failure of hollow sections 15
Failure under static 17
B) Failure under cyclic loading 17
Modes of failure in hollow sections 18
References 19
Introduction
The hollow portion is typically circular to circular (CCHS) and rectangular to rectangular (RRHS). Structures with the circular supports moreover rectangular chord (CRHS) might have benefits in the certain application that combine an easy mutual geometry for manufacturing or a relatively low stress concentration factor (SCF). The SCF value of the CRHS joint was establish to be among the RRHS and CCHS joints. Based on the measured SCF value of the CRHS joints, fatigue strength is very consistent with cu
ent fatigue design specifications. In all cases, the RRHS joint parameter formula gives a more reasonable prediction of the conservative prediction of SCF. These formulas combined with DEn T curve/AWS X2 curve of the tubular joint can be use for the fatigue designs of the CRHS joints.
The fatigue test was ca
y out on a welded very thin-walled (t <4 mm) T-joint with a circular hollow section supported on a square hollow section string, bent in "in-plane" Under load conditions. The stress distribution is measured at the various hot spot location around a chord-support joint where crack initiation is observed and growth leads to the fatigue failure. The Degree of the non-linearity of the stress distribution measured around a weld toe from the support chord connection indicates that the stress distribution are importantly nonlinear along the specified position where the support diameter and chord width ratio are greater than 0.5.
It is suggested to utilize a quadratic way to infer local strain/stress to recognize the hot spot stress. Using measured stress distribution from survey as well as the results of previous studies, the hotspot location line that produces the maximum hot spot stress is suggested. For a given dimensionless parameter, the stress concentration factor (SCF) of welded thin-walled CHS-SHS T-joint is between predicted costs of the SCF of the SHS-SHS or CHS-CHS T-joints. It is recommended to use the existing parametric equation of the SHS-SHS T-joint to estimate SCF of welded thin-walled CHS-SHS T-joint.
The static moreover fatigue properties of eight another hollow section T-shaped joints under axial as well as in-plane bending load were studied experimentally. The joint is a rounded support member and a rectangular wire. Hot spot stress and stress concentration components (SCF) have been experimentally determined. Exhaustion tests ca
ied out under constant amplitude load in the air. Welded truss, which has a spherical hollow section (CHS) support and a concrete filled hollow section cord, is a novel type of a structural system, which is widely used in the
idge in China's larger era.
For such a joint
idge design, the welded CHS-CFCS joint balance power can be fully understood. This paper records the test series for adding the welding CHS-CFCS T-to the axial cyclic fatigue load in the stent. The welding quality of the connecting
acket and chord member has been verified by magnetic particles moreover radiographic control ways. The conclusion is that the CHS-CFCHS T-joints have much lesser stress concentration element when the two joints have the same dimensionless geometry and therefore have superior fatigue strength than CHS-CHS T-joint. A have the same rated voltage on the
acket.
Literature Review: Static and fatigue behavior of hollow section t- joints
Types of hollow Section on with diagrams
The hollow component (HSS) is metal with hollow tubular portion. These parts can be circular, rectangular and square. Hollow components, particularly RHS steel, are generally used for welding steel frames, while CHS and SHS are more commonly use for racks. Hollow steel profiles are generally use as beams. The Flat square squares of RHS have the capability to be easily constructed and sometimes prefe
ed for the architectural aesthetics in exposed structure; however for the same reason the exposed structures have become more circular hollow components (Abd Rahman and Tizani, 2013).
Rectangular Hollow Sections (RHS) – for strength and economy
After the CHS was introduced, RHS became popular in a lot of forms of structural and another structural and mechanical application. The inherent flat surface of this part greatly facilitates this, making bonding and other manufacturing processes more economical. In this case, unlike CHS, these parts only have a straight cut rather than contour cuts. Connecting and soldering RHS requires minimal edge preparation.
Like CHS, RHS can also be use in architectural aesthetic, with clean line, full functionality and less interaction with outer environmental influences (Chen, 2016).
Circular Hollow Sections (CHS) – for strength and aesthetics
This is the first or general form of a hollow profile. It’s use in a variety of application, including building structures as well as other structural or mechanical area. From a building point of view, constant cleanliness provides smooth surface appearances that are often used in lots of high-end applications. The absence of protruding edges on these totally enclosed portions helps to reduce the effects of exposure to the components and also helps to increase the cleanliness of dust and other material buildup (Feng, Chen and Chen, 2017).
Circular Hollow Sections (CHS) – for strength and aesthetics
This is the first or general form of a hollow profile. It is use in a variety of applications, including building structures and other mechanical and structural areas. From a building point of view, constant cleanliness provides a smooth surfaces appearance that is often used in several high-end applications. The absence of protruding edge on these totally enclosed portions helps to reduce the effects of exposure to the components and also helps to increase the cleanliness of dust and other material buildup (Kanna and Yamashita, 2015).
Square Hollow Section (SHS) – for balanced strength, symmetry and aesthetics
In the term of its structural and appearance behavior, the well known SHS is located between RHS and CHS. The “same" symmetry of the SHS tend to show some aesthetic aspects of CHS, but still has a flat surface inherent to RHS for better connectivity. When balancing between strength and function is required, SHS is commonly use in many mechanical and structural applications (Kyung et al., 2011).
Hollow section of metal material is commonly used in engineering construction, and it has been found that the fatigue failure of the actual structures is usually in the weld toe of the joint. Static and fatigue behavior of hollow section joints is a subject of further research, and many researchers have received special attention. Hollow section additions are usually round to round (CHS to CHS) or rectangular oblong (RHS to RHS) rectangular joints. For the land structures weary of the wave weight, the circular hollow section is jointly used almost entirely due to its relatively small hydrodynamic load and stress concentration (Lie, Li and Shao, 2013). However, in the CHS-CHS joint, the members of the hollow part are included together by the main set of wire members...