Spar cap with tapering and serrated end section

A spar cap for a wind turbine blade, wherein the spar cap extends in a longitudinal direction between a first longitudinal end and a second longitudinal end and further in a transverse direction between a first side and a second side, and wherein the spar cap comprises:

• a plurality of reinforcing fibre layers comprising unidirectionally oriented reinforcement fibres, wherein the plurality of reinforcing fibre layers are arranged such that the spar cap tapers in thickness towards the first longitudinal end;
• and
• a number of first fibre skin layers arranged on a first surface of the plurality of reinforcing fibre layers, and a number of second fibre skin layers arranged on a second surface of the plurality of reinforcing fibre layers, such that the plurality of reinforcing fibre layers are arranged between the number of first fibre skin layers and the number of second fibre skin layers,
• wherein the number of first fibre skin layers and the number of second fibre skin layers extend beyond the plurality of reinforcing fibre layers towards the first longitudinal end of the spar cap,
• wherein the first longitudinal end of the spar cap is serrated along the transverse direction forming a first serrated section, and
• wherein the first serrated section is formed in the number of first fibre skin layers and in the number of second fibre skin layers and further extends into one or more of the plurality of reinforcing fibre layers arranged most proximal to the first longitudinal end of the spar cap.

A spar cap for a wind turbine blade, wherein the spar cap extends in a longitudinal direction between a first longitudinal end and a second longitudinal end and further in a transverse direction between a first side and a second side, and wherein the spar cap comprises:

• a plurality of reinforcing fibre layers comprising unidirectionally oriented reinforcement fibres, wherein the plurality of reinforcing fibre layers are arranged such that the spar cap tapers in thickness towards the first longitudinal end;
• and
• a number of first fibre skin layers arranged on a first surface of the plurality of reinforcing fibre layers, and a number of second fibre skin layers arranged on a second surface of the plurality of reinforcing fibre layers, such that the plurality of reinforcing fibre layers are arranged between the number of first fibre skin layers and the number of second fibre skin layers,
• wherein the number of first fibre skin layers and the number of second fibre skin layers extend beyond the plurality of reinforcing fibre layers towards the first longitudinal end of the spar cap,
• wherein the first longitudinal end of the spar cap is serrated along the transverse direction forming a first serrated section, and
• wherein the number of first fibre skin layers are arranged more distal to the first longitudinal end of the spar cap than the number of second fibre skin layers, whereby the number of first fibre skin layers and the number of second fibre skin layers are arranged such that the spar cap and serrations of the first serrated section taper in thickness towards the first longitudinal end of the spar cap and/or wherein the number of first fibre skin layers are arranged more distal to the second longitudinal end of the spar cap than the number of second fibre skin layers, whereby the number of first fibre skin layers and the number of second fibre skin layers are arranged such that the spar cap and the serrations taper in thickness towards the second longitudinal end of the spar cap.