Stress concentration factors for circular, reinforced penetrations in pressurized cylindrical shells a dissertation presented to the faculty of the school of engineering and applied science university of virginia in partial fulfillment of the requirements for the degree doctor of philosophy civil engineering by james w. As the radius of curvature approaches zero, the maximum stress approaches infinity. Petersons stress concentration factorspetersons stress concentration factors, third edition. The profile of the stress in the crosssection through the center of the hole has the form shown in bottom of the figure. Peterson, stressconcentration factors, wiley, new york, 1974, pp. Petersons stress concentration factors pilkey, walter d. Effect of stress concentrations on fatigue of composite. In order to reduce the notch effect, a stress relief groove can be applied, which.
Note that the stress concentration factor is a function. Departement of civilengineering, foshan university, foshan. Most stressconcentration factors are determined by experimental or finite element techniques. Stress concentration and stress concentration factors grooves, fillets, holes, or other abrupt changes in cross section or any disruption of a smooth surface causes increased stresses around these areas. Roarks formulas for stress and strain, 8th edition. Approximate stressconcentration factors kts for a round bar or tube having a transverse round hole and loaded in torsion source. L if notch sensitivity data is not available, it is conservative to use kt in fatigue calculations.
One needs to extra attention as to which referencenominal stress is used before applying these stress concentration factors. Stress concentration factors by rudolf earl peterson, 9780471538493. Interacting stress concentration factors and their effect on fatigue of metallic aerostructures by david warren whitley a dissertation presented to the faculty of the. The influences of shear loading on stress concentration factor are shown in fig. Peterson s stress concentration factors, second edition. It has three widths of b 1 40 mm, b 2 50 mm and b 3 36 mm. The definitive guide to stress concentration, newly revised and updated. A stress concentration also called a stress raiser or a stress riser is a location in an object where the stress is significantly greater than the surrounding region. Petersons stress concentration factors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and expedites their synthesis into cad applications. Effects of stress raisers the stress raising effects of a circular groove in a tensile bar are shown in fig. Petersons stress concentration factors, 2nd edition. Geometric stress concentration factors can be used to estimate the stress amplification in the vicinity of a geometric discontinuity. Peterson s stress concentration factors 3rd edition details peterson s stress concentration factors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and expedites their synthesis into cad applications.
Petersons stress concentration factors, third edition researchgate. Stress concentration and fatigue of welded details, ph. Theoretical stress concentration factor k t in elastic range can be obtained as 2. Fatigue stress concentration factors lkf is normally used in fatigue calculations but is sometimes used with static stresses. Stress concentration factors are used in the design of mechanical or engineering structures and machinery and have a tremendous impact on design of virtually every product or structure subject to environmental or userelated stress from nuclear equipment, deepsea vehicles, and aircraft to space vehicles, underground. Petersons stress concentration factors, 3rd edition wiley. A stress concentration factor is the ratio of the highest stress s max to a reference stress s of the gross crosssection. The stress concentration factor calculators presented in this section calculate both k g and k n, whenever possible. Stress concentration and stress concentration factors. This drilled hole because of its rather large diameter is going to cause smaller stress concentration than a cracks sharp end. Petersons stress concentration factors edition 3 by. Petersons stress concentration fac tors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and expedites their synthesis into cad applications.
Petersons stress concentration factors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and. Geometric stress concentration factors shigley, fig. For fatigue analysis of a hole interacting with a fillet, a conservative modification factor of 1. Approximate stressconcentration factor k t for bending of a round bar or tube with a transverse round hole source. These three concentration factors are related in a relationship which depends of. Predicting weld toe stress concentration factors for t and. Stress concentration factor and why its important to. Compendiums of stress concentrations factors such as stress concentration factors, r. Pointsurfaceorigin pso macropitting occurs at sites of geometric stress concentration gsc such as discontinuities in the gear tooth profile caused by. Stress concentration factors for the left fillet, hole and the right fillet are 1.
For the associated geometry, the stress concentration modification factors increased as the distance between the hole and fillet decreased. Sort by date 1 pointsurfaceorigin macropitting caused by geometric stress concentration januaryfebruary 2011. Buy stress concentration factors by rudolph earl peterson online at alibris. Stress concentration factor formulas useful for any dimensions of shoulder fillet in a flat test specimen under tension and bending article pdf available in journal of testing and evaluation 32.
Peterson, stress concentration factors, wiley, new york, 1974, pp. Imagine that the flow of force is like the flow of water. T d a t d the maximum stress occurs on the inside of the hole, slightly below the shaft surface. Petersons stress concentration factors, 2nd edition 9780471538493 by pilkey, walter d. Approximate stressconcentration factors k ts for a round bar or tube having a transverse round hole and loaded in torsion source. Reference 9 describes two methods to manufacture skewed tjoints. Petersons stress concentration factors, second edition. A new single from david luximon is mesmerizing and atmospheric, soulful vocals alternating with heartfelt spoken word. Stress concentration factor and why its important to project health by proforma safety international project management news in engineering terms, the stress concentration factor is a localized area or concentration of undistributed force for those involved in project management, there isnt much of. If this maximum stress becomes plastic, stress relaxation occurs and the elastoplastic stress concentration is less than the elastic one. Structures and materials section 7 stress concentration. Prediction of maximum stress concentration factors for 197 singular gusset plate geometries decay constants of approximate stress concentration and stress gradient correction factor curve formulas comparison of stress gradient corrections for through and circular crack shapes summary of correction factors for unified stress.
It can be seen from the figure that any stress values larger than. Stress concentration caused by sudden change in form. Petersons stress concentration factors, second edition establishes a system of data classification for all of the applications of stress and strain analysis and expedites their synthesis into cad applications. Petersons stress concentration factors establishes and maintains a system of data. Pdf stress concentration factor formulas useful for any. However, the strain concentration factor is greater than k t. Charts of theoretical stressconcentration factors k. Notch is a general term meaning any or all of the above. Petersons stress concentration factors, 3rd edition pdf free. L convenient to think of kf as a stress concentration factor reduced from kt because of lessened sensitivity to notches. Section 7 stress concentration stress concentrations produced by discontinuities in structures such as holes, notches, and fillets will be introduced in this section. A survey of postpeterson stress concentration factor data. In such joints a high stress concentration also arises in the main plate of the weld root, and fatigue cracking may initiate at either the weld toe or the root.
The original work by peterson portrayed the various relationships between the stress factors effecting certain products or structures and established a system for the classification of these factors. Aerospace, and nuclear engineering at the university of virginia and a leading authority in the areas of stress and strain in mechanical and civil engineering. Petersons stress concentration factors rudolph earl. The new edition updates all of the graphics with computergenerated art. The factor of 3 is known as the stress concentration factor, k t. Substantially revised and completely updated, this book presents stress concentration factors both graphically and with formulas. Approximate stressconcentration factor kt for bending of a round bar or tube with a transverse round hole source. Petersons stress concentration factors, third edition. It also employs computergenerated art in its portrayal. Stress concentration factor important parameter for the safety. Petersons stress concentration factors wiley online books. It is possible to predict the stress concentration factors for certain geometric shapes using theory of elasticity approach. If stress concentration is caused by a crack, then the best way to handle it would be to create a large hole right at the end of that crack.
Stress concentration caused by sudden change in form a change in the geometric shape of a part gives rise to additional stress over and above the calculated stress, which is known as stress concentration. Petersons stress concentration factors, 4th edition wiley. Petersons stress concentration factors second edition. Stress concentrations occur when there are irregularities in the geometry or material of a structural component that. Petersons stress concentration factors, 2nd edition by w.
Petersons stress concentration factors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and expedites their synthesis into cad. Stress concentration factors by rudolph earl peterson. The value of the stress concentration factor is calculated by. Petersons stress concentration factors 3rd edition knovel.
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