
Saravanan ManickamCSIR - Structural Engineering Research Centre, Chennai, India · Fatigue & Fracture Laboratory
Saravanan Manickam
B.E., M.E., Ph.D
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57
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August 2007 - present
Publications
Publications (57)
The primary objective of this manuscript is to verify the LBB criterion, by carrying out fatigue crack growth (FCG) and fracture tests on SA 312 Type 304LN stainless steel pipes having a part-through crack in the circumferential direction. FCG tests were carried out on pipe specimens under constant amplitude loading in bending till the crack became...
In service, the piping components (pipes/elbows) are subjected to different operational loadings such as thermal stress, internal pressure, self-weight, external loading from soil movement, flow induced vibration, vortex induced vibrations and third party damage. Structural integrity assessment of these piping components under postulated accidental...
Fracture studies were carried out on bi-metallic pipe weld joints of 324 mm outer diameter having crack at different regions of weld in the circumferential direction. The bi-metallic pipe weld joints were made of low alloy steel (ferritic) and stainless steel (austenitic) materials. Welding consumable used was nickel-based alloy. The initial notch...
The use of GFRP bars in concrete structures has emerged as an alternative to conventional RC due to the corrosion of steel in aggressive environments. Although many studies were reported on concrete beams reinforced with GFRP bars, still the full potentiality of GFRP reinforced concrete is yet to be known. This study reports experimental, analytica...
The level-3 Leak-Before-Break (LBB) assessment of nuclear piping system is based on simplified fracture mechanics calculations. A postulated through-wall circumferential crack is shown to be stable even under extreme loading conditions. An important aspect of this fracture assessment, which is generally not considered, is the reduction in load at t...
Dissimilar metal joints (DMJs) are more common in the application of piping system of many industries. A 2- D and 3-D finite element analysis (FEA) is carried out on dissimilar metal Single Edged Notch Bending (DMSENB) specimens fabricated from ferritic steel, austenitic steel and Inconel – 182 alloy to study the behavior of DMJs with constraints b...
Fracture resistance of 316LN SS base and welded straight pipes with circumferential through-wall cracks has been evaluated. The pipe J-R curves have been determined using existing experimental methods and analytical expressions available in literature. The J-R curves of 88.9 mm OD pipe and pipe welds have been compared with the J-R curves obtained...
Fracture studies were carried out on narrow gap welded SA 312 Type 304LN stainless steel straight pipes having
circumferential through-wall notch in the weld. Totally six specimens were tested; one specimen was subjected
to monotonic loading and the remaining five specimens were subjected to quasi-cyclic loading. Under quasi-cyclic
loading, one spe...
Fatigue crack growth (FCG) experiments were carried out on Eccentrically-loaded Single Edge notch Tension [ESE(T)] specimens made of SA 333 Gr. 6 and SA 516 Gr. 70 steels under demineralized water and 3.5% NaCl aqueous environments. The corrosion process was accelerated by increasing the corrosion current, using an external current source and the e...
Bi-metallic welded joints are necessary in pressurized and boiling water reactors where heavy section low alloy carbon steel components are connected to stainless steel primary piping systems. The behaviour of such bi-metallic weld joints is very difficult to understand, and very limited experimental data are available in the literature on the frac...
Fracture studies were carried out on 170 mm OD welded straight pipes having circumferential through-wall crack in the weld under quasi-cyclic loading. The specimens were made of Type 304 LN stainless steel and welded using conventional Shielded Metal Arc (SMA) welding or Narrow Gap (NG) welding. The specimens were subjected to different amplitudes...
Elbows are one type of components widely used in various industrial applications in conventional and nuclear power generating plants, chemical processing plants and petroleum refineries. Due to the complexities of geometric structure, elbows are one of the piping components that are prone to failure in the piping system of nuclear power plants (NPP...
Fatigue life of fillet welded cruciform joints with load-carrying welds conforming to Constructional Detail 26 (Detail Category 52) of IS 800: 2007 and made of IS 2062 Gr. E 300 steel plates of two different thicknesses was evaluated. The joints were formed by Manual Metal Arc welding conforming to IS 9595: 2003. The studies were carried out at var...
Corrosion is a crucial problem in steel reinforcement which deteriorates the material when it reacts with the environment. Glass Fibre Reinforced Plastic (GFRP) rebar has emerged as a promising alternative to conventional steel reinforcement with excellent results in terms of corrosion resistance. GFRP rebars are usually composed of glass fibres re...
Ratcheting is defined as cycle by cycle accumulation of plastic strain on application of cyclic load with constant stress amplitude and nonzero mean stress. Ratcheting occurs when a structure is subjected to cyclic loading, if the mean strain changes during any one loading cycle at one or more points of the structure with respect to the mean strain...
Engineering components are often subjected to cyclic load excursions beyond elastic limit and hence cyclic plastic deformation of engineering materials becomes inevitable. Since the resultant elastic-plastic stress-strain response of the material plays a pivotal role in analysis, design and failure of the component, it becomes important to understa...
This paper presents the results of fatigue tests conducted on typical welded and bolted connections made of IS 2062: 2011 steel and conforming to selected Constructional Details categorised in IS 800: 2007. The connection types include: Longitudinal and transverse butt welded connections, fillet welded cruciform connections with load-carrying and n...
The use of Glass Fibre Reinforced Plastic (GFRP) rebars as a potential replacement for steel reinforcement has raised quite a bit of controversy among the professionals and engineers engaged in the construction industry. Divergent views have beenopined by the professionals for its usage in civil engineering structures. Even though, the GFRP rebar h...
Engineering components are often subjected to cyclic load excursions beyond elastic limit and hence cyclic plastic deformation of engineering materials becomes inevitable. Since the resultant elastic-plastic stress-strain response of the material plays a pivotal role in analysis, design and failure of the component, it becomes important to understa...
Pipe bends or elbows are commonly used components for nuclear power plant piping system. In service, these piping components are subjected to internal pressure in addition to bending loads and the internal pressure is known to have a significant effect on the load carrying capacity of these components. Hence, a systematic study was carried out to i...
Ratcheting is a phenomenon which leads to reduction in fatigue life of a structural component by loss of ductility due to cycle by cycle accumulation of plastic strain. Ratcheting occurs in a structure subjected to a combination of steady/sustained and cyclic loads such that the material response is in inelastic region. Ratcheting studies were carr...
The design of Nuclear Power Plant piping is based on Leak-Before-Break (LBB) design philosophy. The integrity of cracked nuclear piping system in LBB is often examined from conventional fracture mechanics. Conventionally the fracture analysis is performed by assuming infinite compliance of the piping system, which means that the stiffening effect o...
This paper presents the results of fatigue tests conducted on simple constructional details categorised in IS 800:2007. The specimens were made of IS 2062 steel. The tests were carried out at various values of maximum stress which were decided as a percentage of yield strength of the material. The S-N data obtained for these connections are compare...
In level-3 Leak-Before-Break (LBB) analysis, stability of a postulated through-wall circumferential crack is demonstrated by simplified fracture mechanics calculations. Detailed experimental studies, conducted by the authors, have revealed that the conventional assessment procedure used to demonstrate LBB is too conservative. There is a large facto...
Fatigue-Ratcheting' is a phenomenon which leads to reduction in fatigue life of a structural component by loss of ductility due to cycle-by-cycle accumulation of plastic strain. One real-life example of a situation with fatigue ratcheting possibility is piping of power plants subjected to internal pressure and large amplitude cyclic bending during...
'Fatigue Ratcheting' is a phenomenon which leads to reduction in fatigue life of a structural component by loss of ductility due to cycle-by-cycle accumulation of plastic strain. One real-life example of a situation with fatigue ratcheting possibility is piping of power plants subjected to internal pressure (primary load) and cyclic bending (second...