According to the definition shape and structure of apricot stones

together with the analysis of physical features of its structure

the conclusion of mechanical analysis of cracking has been drawn that the relationship between the core's length

width and height is not simply linear the core can approximately be on shell which is symmetry on its transverse

upright and vertical elliptical section.Apricot stone shell is studied as an unusual shape covered with pressures of cracking similar in forces and distribute evenly.Based on this assumption

its synthetic stress and dangerous section is analyzed.Transform semidiameter L is introduced into the formula of inflect moment

thus it simplifies calculation.Conclusion is drawn by statistics and validate that the best section of apricot stone cracking is the maximum stress section

that is the minimum transform semidiameter in the oval section.