Wearable article with extensible fastening member having stress distribution features and/or fastening combination performance characteristics

A disposable diaper, comprising:

• a chassis having a front waist region, a rear waist region, a landing zone disposed on the front waist region, the landing zone comprising a loop material, and
• an integrally-formed, highly extensible fastening member extending laterally from the rear waist region to an outboard end and having a fastening member length (L), an extensible zone bounded by inboard and outboard extensible zone extents, a strengthened end region disposed outboard of the extensible zone, a fastener zone disposed on said strengthened end region, said fastener zone having first and second inboard fastener zone corners, said fastener zone having a Stiffness of at least about 1,500 N/m and having a fastener disposed thereon, the strengthened end region having an inboard length (LR) that is less than the fastening member length (L), the fastener comprising a hook material, wherein the loop material and the hook material form a fastening combination,
• wherein said fastening member extends from a junction line along a stretch direction transverse to said junction line, and ends at the outboard end, wherein said junction line connects first and second longitudinally outermost junction points on a first longitudinally outermost lateral edge and an opposing second longitudinally outermost lateral edge, respectively, of said fastening member, said first longitudinally outermost lateral edge having a first profile beginning at said first longitudinally outermost junction point and ending at said outboard end, and said second longitudinally outermost lateral edge having a second profile beginning at said second longitudinally outermost junction point and ending at said outboard end;
• wherein said fastening member has an acting width (WA) measured from an outboard edge of said fastener zone to said inboard extensible zone extent;
• said acting width is bounded by longitudinal lines W0 and W100, and said acting width may be divided into four equal portions by longitudinal lines W25 at 25% of said acting width, W50 at 50% of said acting width, and W75 at 75% of said acting width;
• said fastening member has lengths L0, L25, L50 and L100 measurable along lines W0, W25, W50, and W100, respectively, and the following relationships exist:
• at least one of said first and second profiles has an inflection point approximately between lines W25 and W50, at which said at least one of said first and second profiles changes curvature from concave to convex;
• L0 is at least about 25% of L100;
• L25 is at least about 30% of L100;
• and
• L50 is at least about 50% of L100.