Large bending moment and less shear force.

Explanation:
Flexural shear failure occurs when there is a combination of bending moment and shear force acting on a structural member. It typically happens in beams and slabs where the applied loads cause the member to bend and shear simultaneously.

When a member is subjected to bending, there is a moment created that causes the member to deflect or bend. This bending moment induces tensile and compressive stresses on the top and bottom fibers of the member, respectively. At the same time, shear forces act perpendicular to the longitudinal axis of the member causing shear stresses.

Under normal conditions, a structural member can resist both bending and shear forces. However, in the case of flexural shear failure, the applied bending moment is larger compared to the shear force. This means that the member is predominantly experiencing bending rather than shear.

The failure occurs when the tensile or compressive stresses exceed the capacity of the material, leading to cracks or fractures. These cracks propagate along the shear planes, resulting in a failure mode known as flexural shear failure.

In contrast, if the shear force is significantly larger than the bending moment, shear failure would occur instead of flexural shear failure. Shear failure happens when the shear stress exceeds the shear strength of the material, causing the member to fail along a diagonal plane.

It is important to note that the strength of a member against flexural shear failure depends on various factors such as the material properties, cross-sectional geometry, and the applied loads. Design considerations and proper reinforcement are essential to prevent flexural shear failure and ensure the structural integrity of the member.