He is the author of formulas for stress, strain, and structural. 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. 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. It also employs computergenerated art in its portrayal. Petersons stress concentration factors, 2nd edition. Departement of civilengineering, foshan university, foshan. Peterson s stress concentration factors, second edition. T d a t d the maximum stress occurs on the inside of the hole, slightly below the shaft surface. Stress concentration caused by sudden change in form. A stress concentration factor is the ratio of the highest stress s max to a reference stress s of the gross crosssection.
Petersons stress concentration factors wiley online books. Pdf stress concentration factor formulas useful for any. Geometric stress concentration factors shigley, fig. Section 7 stress concentration stress concentrations produced by discontinuities in structures such as holes, notches, and fillets will be introduced in this section. Notch is a general term meaning any or all of the above. 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. Approximate stressconcentration factors k ts for a round bar or tube having a transverse round hole and loaded in torsion source. Geometric stress concentration factors can be used to estimate the stress amplification in the vicinity of a geometric discontinuity. Stress concentration factors by rudolf earl peterson, 9780471538493. 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. Sort by date 1 pointsurfaceorigin macropitting caused by geometric stress concentration januaryfebruary 2011. As the radius of curvature approaches zero, the maximum stress approaches infinity.
Structures and materials section 7 stress concentration. The factor of 3 is known as the stress concentration factor, k t. 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. Stress concentration and stress concentration factors. The stress concentration factor calculators presented in this section calculate both k g and k n, whenever possible. Petersons stress concentration factors pilkey, walter d. Roarks formulas for stress and strain, 8th edition. 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. 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. Effect of stress concentrations on fatigue of composite. Imagine that the flow of force is like the flow of water.
If this maximum stress becomes plastic, stress relaxation occurs and the elastoplastic stress concentration is less than the elastic one. Petersons stress concentration factors, 4th edition wiley. Approximate stressconcentration factors kts for a round bar or tube having a transverse round hole and loaded in torsion source. Petersons stress concentration factors edition 3 by. 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. Predicting weld toe stress concentration factors for t and. Petersons stress concentration factors, 2nd edition by w. Petersons stress concentration factors second edition. Petersons stress concentration factorspetersons stress concentration factors, third edition. Petersons stress concentration factors, 2nd edition 9780471538493 by pilkey, walter d. 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. It has three widths of b 1 40 mm, b 2 50 mm and b 3 36 mm. 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. Petersons stress concentration factors rudolph earl.
Stress concentrations occur when there are irregularities in the geometry or material of a structural component that. 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. Approximate stressconcentration factor kt for bending of a round bar or tube with a transverse round hole source. A survey of postpeterson stress concentration factor data.
Charts of theoretical stressconcentration factors k. The new edition updates all of the graphics with computergenerated art. In order to reduce the notch effect, a stress relief groove can be applied, which. Substantially revised and completely updated, this book presents stress concentration factors both graphically and with formulas. Fatigue stress concentration factors lkf is normally used in fatigue calculations but is sometimes used with static stresses.
Petersons stress concentration factors 3rd edition knovel. Stress concentration factor and why its important to. 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 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, third edition researchgate. Peterson, stressconcentration factors, wiley, new york, 1974, pp. The bible of stress concentration factorsupdated to reflect todays advances in stress analysis this book establishes and maintains a system of data classification. Approximate stressconcentration factor k t for bending of a round bar or tube with a transverse round hole source. Reference 9 describes two methods to manufacture skewed tjoints.
Compendiums of stress concentrations factors such as stress concentration factors, r. The definitive guide to stress concentration, newly revised and updated. Petersons stress concentration factors, third edition. However, the strain concentration factor is greater than k t. One needs to extra attention as to which referencenominal stress is used before applying these stress concentration factors. Stress concentration and fatigue of welded details, ph. Stress concentration factor important parameter for the safety. Petersons stress concentration factors establishes and maintains a system of data classification for all of the applications of stress and strain analysis and.
Petersons stress concentration factors, second edition. Petersons stress concentration factors establishes and maintains a system of data. Effects of stress raisers the stress raising effects of a circular groove in a tensile bar are shown in fig. Buy stress concentration factors by rudolph earl peterson online at alibris. 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. These three concentration factors are related in a relationship which depends of. The value of the stress concentration factor is calculated by. The influences of shear loading on stress concentration factor are shown in fig. For fatigue analysis of a hole interacting with a fillet, a conservative modification factor of 1. It is possible to predict the stress concentration factors for certain geometric shapes using theory of elasticity approach. Stress concentration factors by rudolph earl peterson. L convenient to think of kf as a stress concentration factor reduced from kt because of lessened sensitivity to notches.
L if notch sensitivity data is not available, it is conservative to use kt in fatigue calculations. It can be seen from the figure that any stress values larger than. A new single from david luximon is mesmerizing and atmospheric, soulful vocals alternating with heartfelt spoken word. Petersons stress concentration factors, 3rd edition pdf free. The profile of the stress in the crosssection through the center of the hole has the form shown in bottom of the figure. Most stressconcentration factors are determined by experimental or finite element techniques. Pointsurfaceorigin pso macropitting occurs at sites of geometric stress concentration gsc such as discontinuities in the gear tooth profile caused by. Note that the stress concentration factor is a function.
This drilled hole because of its rather large diameter is going to cause smaller stress concentration than a cracks sharp end. Peterson, stress concentration factors, wiley, new york, 1974, pp. Stress concentration factors for the left fillet, hole and the right fillet are 1. Theoretical stress concentration factor k t in elastic range can be obtained as 2. 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.
Interacting stress concentration factors and their effect. For the associated geometry, the stress concentration modification factors increased as the distance between the hole and fillet decreased. 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. Interacting stress concentration factors and their effect on fatigue of metallic aerostructures by david warren whitley a dissertation presented to the faculty of the. 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.
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